H NHCOCHCI, 25.02N CH:OH OHH CH, 26. 0 C-COOC:Hs CH, - COOC2 Hs CH; 28. HO CH2 CH:NH2·CHl 29 HO 547[ HOPUUU Z Nlc|HPUFLE OH -H Hlcio dr\\ O N C G cooc H • HCI CI 28. HO飞/飞 • CHI 29. I II HO\/ 547