Figure 3.
Two novel oleanolic acid prodrugs: (a) cis-3-O-[4-(R)-(3-chlorophenyl)-2-oxo-1,3,2-dioxaphosphorinan-2-yl]-oleanolic acid (b) cis-3-O-[4-(S)-(3-chlorophenyl)-2-oxo-1,3,2-dioxa-phosphorinan-2-yl]oleanolic acid [15].
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