| abstract |
"CEFEM COMPOUNDS". The present invention relates to a compound of the formula [I]: where R3 is lower alkyl, hydroxy (lower) alkyl or halo (lower) alkyl, and R2 is hydrogen or amino protecting group, or R 13 and R 12 are linked together and form lower alkylene or lower alkenylene; R3 is hydrogen or lower alkyl; R4 is R5 is carboxy or protected carboxy; and R6 is a protected amino or amino, or a pharmaceutically acceptable salt thereof, a process for preparing a compound of formula [I], and a pharmaceutical composition comprising a compound of formula [I] in admixture with a pharmaceutically acceptable conductor. . |