... 2αααα,3αααα-di-O -acetyl,19αααα-hydroxy-urs-12-en-28-oic EA1b: acid 2αααα-O-acetyl,3αααα,19αααα-di-hydroxy -urs-12-en-28-oic EA1: acid 2αααα,3αααα,19αααα - trihydroxy-12-ursen-28-oic ... acid 2α, 3α-di-O-acetyl,19α-hydroxy-urs-12-en-28-oic, CTPT: C34H50O7. Chất EA1b (acid 2αααα-O-acetyl,3αααα,19αααα-dihydroxy-urs-12-en-28-oic) Phổ 1H- và 13C-NMR của chất ... gồm: acid 2α,3α-di-O-acetyl,19α-hydroxy-urs-12-en-28-oic (EA1a), acid 2α-O-acetyl,3a,19α-dihydroxy-urs-12-en-28-oic (EA1b), ursolic acid 3β-acetate (EA2a) và pomolic acid 3β-acetate (EA3a)....