CH CH2CH2CH2 N CH, 15. O CH2CONH- CH; N CH; H COOH CI CH, CH-COOH 16. CHCH CH2 N CH3 CH-COOH CH; o cooc.n. CH, HCI COOC,H CH2 OH 19.H-C-0H HO OH 20. HN 35014UJD 15. 。…主iJd: 16. CI-( )\/CH3 0/ \CH3 17. CI-0-斗COO /\ 18. CH3 -N X \ ---f COOCz Hs CHzOH 19. H-C-OH 址。 HO OH 20. O 盹吨 350 pt: 盹刚时 V O • HCI