Patent ID: 6413983
Filing Date: 2002-07-02
Classification: C07D

Abstract:
A compound of formula 1, its isomer or pharmaceutically acceptable salt: Whereinn is 0 or 1; R1 represents H, NO2, or NH2; R2 represents OH, or O(C&boxH;O)Ra; and Ra represents H; straight or branched alkyl group of C1-C4; or aryl group; R3 represents H, C(&boxH;O)ORa, CH2ORa, or C(&boxH;O)NRa2; and Ra is defined as above; or R2 and R3 are connected to form lactone ring R4 represents H, halogen, OH, or ORa; and Ra is defined as above; * represents the chiral center; and single or double bond exists at 2,3-position of heterocycle.