| 摘要 |
PCT No. PCT/EP95/00383 Sec. 371 Date Aug. 12, 1996 Sec. 102(e) Date Aug. 12, 1996 PCT Filed Feb. 1, 1995 PCT Pub. No. WO95/22552 PCT Pub. Date Aug. 24, 1995A compound of formula (I): <IMAGE> (I) wherein the broken lines represent independently optional bonds, R1 and R2 being absent when the C22-C23 double bond is present. |
