| abstract |
Compound of formula (I) having an excellent cardiotonic action. In said formula, Y represents a C1-4 alkylene which can be substituted by a C1-18 alkyl, a C1-5 alkoxy, a C1-5 alkylthio C1-5 alkyl, a C1-5 alkoxycarbonyl or a benzyl, or (a) where each r1 and r2 represents hydrogen, C1-18 alkyl, C1-5 alkoxy, C1-5 alkylthio C1-5 alkyl, C1-5 alkoxycarbonyl or benzyl; and R1 represents hydrogen, C1-5 alkyl which may be substituted by C1-5 alkoxy, acetyl or C2-5 alkenyl; R2 represents hydrogen or methyl; each R3 and R4 represents hydrogen, halogen, hydroxy, C1-5 alkyl or C1-5 alkoxy; R5 represents hydrogen or C1-5 alkyl which may be substituted by hydroxy; R4 and R5 can form a nucleus by uniting, and - represents a single or double bond. |