... dugc 12 phan doan (Fl-F12). Phan doan F2+F3 kit tinh trong EtOAc thu dugc chit rin mau tring ky hieu la CH-1 (3,4 g, hi. 0,566% tinh theo miu la khd). CH-1 chi cho mdt vet trdn tren ... lie diu, day kin trong 30'. Cit loai dung mdi, them nudc va chilt san pham bing EtOAc. Tinh che sin pham bing sic ky cot silicagel (n-hexan-MeOH, 98:2) thu dugc 3/?-hydroxy-urs-12-en-11-on ... bang 1. Ill - KET QUA vA THAO LUAN San pham ky hieu la CH-1 (3,4 g, hi. 0,566 %) dugc kit tinh tir EtOAc (xem phan thuc nghiem). CH-1 ehi cho mdt vet trdn tren sic ky ldp mdng ngay ci...