Abstract: The invention provides a compound having a selective inhibitory activity against highly-expressed LAT-1 in tumor cell. The compound is represented by the formula (I): wherein each symbol is as defined in the specification, or a salt thereof, and a LAT-1 inhibitor comprising the same.

Abstract: The invention provides a compound having a selective inhibitory activity against highly-expressed LAT-1 in tumor cell. The compound is represented by the formula (I): wherein each symbol is as defined in the specification, or a salt thereof, and a LAT-1 inhibitor comprising the same.

Abstract: Compounds of the formula ##STR1## where Y is alkyl, aryl or heterocyclic, n is 1-7, R is hydrogen, alkyl, aralkyl or carboxymethyl, R.sub.1 is acetoxy, thiophenoxy, hydrogen, halo, alkyl, alkoxy or trifluoromethyl, R.sub.2 is hydrogen, alkyl or alkanoyl and X is C.dbd.O, CH.sub.2, NH, O or S as antiallergy and antiinflammatory agents.

Abstract: Compounds of the formula ##STR1## where Y is alkyl, aryl or heterocyclic, n is 1-7, R is hydrogen, alkyl, aralkyl or carboxymethyl, R.sub.1 is acetoxy, thiophenoxy, hydrogen, halo, alkyl, alkoxy or trifluoromethyl, R.sub.2 is hydrogen, alkyl or alkanoyl and X is C.dbd.O, CH.sub.2, NH, O or S as antiallergy and antiinflammatory agents.

Abstract: Compounds of the formula ##STR1## where Y is alkyl, aryl or heterocyclic, n is 1-7, R is hydrogen, alkyl, aralkyl or carboxymethyl, R.sub.1 is acetoxy, thiophenoxy, hydrogen, halo, alkyl, alkoxy or trifluoromethyl, R.sub.2 is hydrogen, alkyl or alkanoyl and X is C.dbd.O, CH.sub.2, NH, O or S as antiallergy and antiinflammatory agents.

Abstract: Compounds of the formula ##STR1## where Y is alkyl, aryl or heterocyclic, n is 1-7, R is hydrogen, alkyl, aralkyl or carboxymethyl, R.sub.1 is acetoxy, thiophenoxy, hydrogen, halo, alkyl, alkoxy or trifluoromethyl, R.sub.2 is hydrogen, alkyl or alkanoyl and X is C.dbd.O, CH.sub.2, NH, O or S as antiallergy and antiinflammatory agents.

Abstract: The invention relates to novel peptides, of pharmacological activity, of the formula: ##STR1## wherein R.sup.1 is hydrogen,R.sub.b.sup.1 is methyl,R.sup.2 is carboxy, carboxymethylcarbamoyl, 1-carboxyethylcarbamoyl or ethoxycarbonylmethylcarbamoyl,R.sup.q is carboxy or 3-t-butoxycarbonylcarbazoyl,R.sup.p is carboxy or methoxycarbonyl,R.sup.r is hydrogen, t-butoxycarbonyl or benzyloxycarbonyl,m is the integer 2, andn is the integer 1, or its pharmaceutically acceptable salt.

Abstract: The invention relates to novel peptides of enhanced pharmacological activity of the formula: ##STR1## wherein R.sup.1 is hydroxyalkanoyl,R.sup.2 and R.sup.q are each hydrogen, carboxy, protected carboxy, or a group of the formula: ##STR2## wherein R.sub.a.sup.2 is mono- or di-carboxy (or protected carboxy) lower alkyl or ar(carboxy or protected carboxy) lower alkyl whose aryl moiety may be substituted by hydroxy, R.sup. 2 is hydrogen or lower alkyl; R.sup.p is hydrogen, carboxy, protected carboxy, with proviso that when one of R.sup.2 and R.sup.q is hydrogen, then the other is carboxy or protected carboxy or a group of the formula: ##STR3## wherein R.sub.a.sup.2 and R.sub.b.sup.2 are each as defined above; R.sup.r is hydrogen or amino protective group; m is an integer 1 to 3;or its pharmaceutically acceptable salt.

Abstract: The invention concerns peptides, having the pharmaceutical property of enhancing the immune response, having the structure: ##STR1## wherein R.sup.1 is alkanoyl,R.sub.b.sup.1 is hydrogen, methyl, isopropyl, hydroxymethyl, protected hydroxymethyl or benzyl,R.sup.2 is hydrogen, carboxy, protected carboxy or a group of the formula: ##STR2## wherein R.sub.a.sup.2 is mono- or di-carboxy (or protected carboxy) lower alkyl or ar(carboxy or protected carboxy) lower alkyl whose aryl moiety is substituted by hydroxy or not substituted,R.sub.b.sup.2 is hydrogen or lower alkyl,R.sup.p is hydrogen, carboxy or protected carboxy,R.sup.q is carboxy, protected carboxy or a group of the formula ##STR3## wherein R.sub.a.sup.2 and R.sub.b.sup.2 are each as defined above, R.sup.r is hydrogen or amino protective group,m is an integer 1 to 3, andn is an integer 1.

Abstract: The invention relates to novel quinolizinone compounds, of inhibitory activity on allergies and ulcers, of the formula: ##STR1## wherein R.sup.1 is carboxy, carbamoyl Y.sup.1, phenylcarbamoyl which may have hydroxy, cyano or thiocarbamoyl,R.sup.7 is hydrogen or aryl selected from phenyl, tolyl, xylyl, cumenyl, naphthyl and biphenylyl;R.sup.2 is hydrogen, hydroxy, lower alkyl or lower alkoxy; andR.sup.

Abstract: The invention relates to novel peptides of enhanced pharmacological activity of the formula: ##STR1## wherein R.sup.1 is alkanoyl;R.sup.2 and R.sup.q are each hydrogen, carboxy, protected carboxy, or a group of the formula: ##STR2## wherein R.sub.a.sup.2 is mono- or di-carboxy (or protected carboxy) lower alkyl or ar(carboxy or protected carboxy) lower alkyl whose aryl moiety may be substituted by hydroxy,R.sub.b.sup.2 is hydrogen or lower alkyl;R.sup.P is hydrogen, carboxy, protected carboxy, with proviso that when one of R.sup.2 and R.sup.q is hydrogen, then the other is carboxy or protected carboxy or a group of the formula: ##STR3## wherein R.sub.a.sup.2 and R.sub.b.sup.2 are each as defined above; R.sup.r is hydrogen or amino protective group;m is an integer 1 to 3;or its pharmaceutically acceptable salt.

Abstract: The invention relates to novel quinolizinone compounds having inhibitory activity on allergies and ulcers, of the formula: ##STR1## wherein R.sup.1 is tetrazolylcarbamoyl;R.sup.7 is hydrogen or aryl selected from phenyl, tolyl, xylyl, cumenyl, naphthyl and biphenylyl;R.sup.2 is hydrogen, hydroxy, lower alkyl or lower alkoxy;R.sup.

Abstract: The invention relates to compounds and salts of compounds which are diaminopimelyl peptides, N-acetoxypropionyl or N-t-butoxycarbonyl-amino-acid - (.alpha.-OBzl) glutamic acid peptides or N-acylated derivatives of (.alpha.-OBzl) glytamic acid or of (.alpha.-OBzl) aminoadipic acid.The compounds and their salts are starting materials for the preparation of pharmacologically active peptides.

Abstract: The invention relates to novel peptides of pharmacological activity, of the formula ##STR1## wherein R.sup.1 is hydrogen or acyl;R.sup.2 is carboxy or protected carboxy or a group of the formula: --COHN--R.sub.a.sup.2 wherein R.sub.a.sup.2 is carboxy (lower) alkyl or protected carboxy (lower) alkyl;R.sup.3 is carboxy, protected carboxy, lower alkyl, hydroxyphenyl, carbamoyl or a group of the formula: ##STR2## wherein R.sub.a.sup.3 is hydrogen, amino, protected amino or acylamino, R.sub.b.sup.3 is carboxy or protected carboxy;R.sup.p is carboxy, protected carboxy, carbamoyl, carboxy (lower) alkyl or protected carboxy (lower) alkyl;l is an integer 0;m is an interger 3; andn is an integer 1, provided that when R.sup.1 is hydrogen or acyl,R.sup.2 is carboxy, protected carboxy or a group of the formula:--CONHR.sub.a.sup.2 wherein R.sub.a.sup.2 is carboxy (lower) alkyl or protected carboxy (lower) alkyl,R.sup.p is carboxy, or protected carboxy,R.sup.

Abstract: The invention relates to a biologically pure culture of new strains of the microorganism Streptomyces which are capable upon fermentation of producing a peptide of pharmacological activity.

Abstract: This invention relates to novel peptides, of pharmacological activity, of the formula: ##STR1## wherein R.sup.1 is heptanoyl, stearoyl, 2-hydroxypropionyl or 2-acetoxypropionyl,R.sup.2 is hydrogen or methyl,R.sup.3 is carboxy, benzyloxycarbonyl or hydroxymethyl,R.sup.4 is hydrogen or methyl,R.sup.5 is carboxy or hydroxymethyl,R.sup.6 is carboxy, methoxycarbonyl, 3-t-butoxycarbonylcarbazoyl or hydroxymethyl,R.sup.7 is hydrogen, 3-t-butoxycarbonyl or benzyloxycarbonyl, andn is an integer 0 or 1, with the proviso that when each of R.sup.3 and R.sup.6 is not simultaneously hydroxymethyl, then R.sup.5 is hydroxymethyl.

Abstract: The invention deals with novel peptides useful for the therapeutic treatment of infectious diseases caused by pathogenic microorganisms, having the structure: ##STR1## wherein R.sup.1 is hydrogen, substituted or unsubstituted alkanoyl, or substituted or unsubstituted aralkanoyl,R.sup.2 is carboxy or protected carboxy,R.sup.3 is carboxy, protected carboxy, carbamoyl, or carboxy or protected carboxy(lower)alkylcarbamoyl,R.sup.4 is carboxy, protected carboxy or carbamoyl, andR.sup.5 is hydrogen or an amino protective group, with proviso that at least one of R.sup.3 and R.sup.4 is always carbamoyl and their pharmaceutically acceptable salts.

Abstract: The invention relates to novel peptides and their pharmaceutically acceptable salts, particularly useful for pharmaceutical purposes such as in the therapeutic treatment of infectious diseases caused by pathogenic microorganisms. The compounds have the structure ##STR1## wherein R.sup.1 is hydrogen or acyl;R.sup.2 is carboxy or protected carboxy or a group of the formula: --COHN--R.sub.a.sup.2 wherein R.sub.a.sup.2 is carboxy (lower) alkyl or protected carboxy (lower) alkyl;R.sup.3 is carboxy, protected carboxy, lower alkyl, hydroxyphenyl, carbamoyl or a group of the formula: ##STR2## wherein R.sub.a.sup.3 is hydrogen, amino, protected amino or acylamino, R.sub.b.sup.3 is carboxy or protected carboxy,R.sup. is carboxy, protected carboxy, carbamoyl, carboxy (lower) alkyl or protected carboxy (lower) alkyl;l is an integer 2,m is an integer 0 to 2 andn is an integer 1, provided that, whenR.sup.1 is hydrogen or acyl,R.sup.2 is carboxy, protected carboxy or a group of the formula: --CONHR.sub.a.sup.2 wherein R.

Abstract: The invention deals with novel peptides useful in the therapeutic treatment of infectious diseases caused by pathogenic microorganisms having the structure: ##STR1## wherein, R.sup.1 is hydrogen or acyl,R.sup.2 is lower alkyl,R.sup.3 is carboxy or protected carboxy,R.sup.4 is hydrogen or lower alkyl,R.sup.5 is hydrogen, alkyl or ar(lower)alkyl,R.sup.6 is carboxy or protected carboxy, andR.sup.7 is hydrogen or an amino protective group,and their pharmaceutically acceptable salts.

Abstract: The invention deals with novel peptides useful for the therapeutic treatment of infectious diseases caused by pathogenic microorganisms. Included is the peptide FR900156 having the structure: ##STR1## as well as the peptides of the structure ##STR2## wherein R.sup.1 is acyl;R.sub.b.sup.1 is hydrogen, methyl, isopropyl, hydroxymethyl, protected hydroxymethyl or benzyl;R.sup.2 is hydrogen, carboxy, protected carboxy, or a group of the formula: ##STR3## wherein R.sub.a.sup.2 is mono- or di-carboxy lower alkyl or ar(carboxy) lower alkyl whose aryl moiety may be substituted by hydroxy,R.sub.b.sup.2 is hydrogen or lower alkyl;R.sup.p and R.sup.q are each hydrogen, carboxy, protected carboxy, with proviso that when one of R.sup.2 and R.sup.q is hydrogen, then the other is carboxy or protected carboxy;R.sup.r is hydrogen or amino protective group; m is an integer 1 to 3, and n is 1 .Iadd.provided that when R.sup.1 is benzyloxycarbonyl R.sub.5.sup.1 is methyl, m is an integer 2 and n is an integer 1, then R.sup.