Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I), wherein R1 is as defined in the claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors. Methods of treatment and pharmaceutical dosage forms are also disclosed.

Abstract: Compounds of formula (I) exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors.

Abstract: Compounds of formula (I), wherein R1-R4, X, Y and Z are as defined in claims, exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors.

Abstract: Compounds of formula (I) exhibit COMT enzyme inhibiting activity and are thus useful as COMT inhibitors.

Abstract: Therapeutically active compounds of formula (I): in which R1 to R4 means hydrogen, alkyl, alkenyl, aryl, arylalkyl, carboxyalkyl, hydroxyalkyl or halogenalkyl, or R2 and R3 form a ring of 5-7 carbon atoms, R5 to R9 means hydrogen, alkyl, alkenyl, aryl, arylalkyl, acyl, hydroxy, alkoxy, alkoxycarbonyl, amino, acylamino, alkylamino, aryloxy, halogen, cyano, nitro, carboxy, alkylsufonyl, sulfonamido or trifluoromethyl, wherein each aryl residue defined above by itself or as a part of another group may be substituted, and pharmaceutically acceptable salts and esters thereof. The compounds increase the calcium sensitivity of contractile proteins of the cardiac muscle and are thus useful in the treatment of congestive heart failure.

Abstract: Therapeutically active compounds of formula (I) in which R1 to R4 means hydrogen, alkyl, alkenyl, aryl, arylalkyl, carboxyalkyl, hydroxyalkyl or halogenalkyl, or R2 and R3 form a ring of 5-7 carbon atoms. R5 to R9 means hydrogen, alkyl, alkenyl, aryl, arylalkyl, acyl, hydroxy, alkoxy, alkoxycarbonyl, amino, acylamino, alkylamino, aryloxy, halogen, cyano, nitro, carboxy, alkylsulfonyl, sulfonamido or trifluoromethyl, wherein each aryl residue defined above by itself or as a part of another group may be substituted, and pharmaceutically acceptable salts and esters thereof. The compounds increase the calcium sensitivity of contractile proteins of the cardiac muscle and are thus useful in the treatment of congestive heart failure.

Abstract: The invention relates to compounds of formula (I) ##STR1## wherein R.sub.1 is an electronegative substituent, preferably nitro, cyano, formyl or carboxy, R.sub.2 is --A--R.sub.4, wherein A is a branched or straight chain C.sub.1-9 alkylene and R.sub.4 is carboxy or 5-tetrazolyl; R.sub.3 is an electronegative substituent, preferably nitro, cyano, halogen, formyl, carboxy, C.sub.1-5 alkyl carbonyl, aryl carbonyl or SO.sub.2 R.sub.6, wherein R.sub.6 is a branched or straight chain C.sub.1-5 alkyl, aryl alkyl, aryl or NR.sub.7 R.sub.8, wherein R.sub.7 and R.sub.8 are independently hydrogen, a branched or straight chain C.sub.1-5 alkyl or together form a C.sub.3-6 ring; or a pharmaceutically acceptable ester or salt thereof. The compounds are peripheral, long acting COMT (catechol-O-methyl transferase) inhibitors and are useful, e.g., in the treatment of Parkinson's disease and hypertension.