Abstract: The invention relates to a compound of formula (I) ##STR1## wherein X is a pharmacologically acceptable anion,R.sub.1 and R.sub.2 are independently of each other hydrogen, or an --OY group in which Y is hydrogen, an .alpha.-aminoacyl, or a C.sub.1-5 aminoalkyl residue,R.sub.3, R.sub.4 and R.sub.7 are independently of each other hydrogen, or a C.sub.1-5 alkyl residueR.sub.5 is hydrogen, and .alpha.-aminoacyl, or a C.sub.1-5 alkyl residue, andR.sub.6 is hydrogen, OH.sup.-, or a C.sub.1-5 alkyl residue,and pharmaceutically acceptable salts and esters thereof; and to condensation processes for preparing them.

Abstract: The invention relates to a method for producing isolating and purifying trophoblast interferon proteins such as .beta.-interferons, .alpha..sub.I -interferon proteins, .alpha..sub.II -interferon proteins, and .gamma.-interferon proteins, and to a method of using the interferon proteins, e.g. for inhibiting tumoral growth or metastatic processes, for preventing graft-versus-host reaction, against leukemia, against viral activity, and against infection of the placenta; as well as antibodies against the interferon proteins.