Methyl 3,23-O-isopropylideneasiatate

3β,23-Isopropylidenebisoxy-2α-hydroxyurs-12-en-28-oic acid methyl ester

2α-Hydroxy-3β,23-[(1-methylethylidene)bis(oxy)]urs-12-en-28-oic acid methyl ester