| 摘要 |
A pharmaceutical composition comprising a pharmaceutical diluent and a compound of formula (II), wherein R 1 and R2, the same or different from each other, are H, C1-C20 alkyl, cycloalkyl, alkenyl, aryl, arylalkyl, or alkylaryl, -CH2CORS, -CH2C(O)NRS, - C(O)R5, or -CH2OR5, and can optionally contain halogen atoms, where R5 is a C1-C12 alkyl group. R3 and R4, the same or different from each other, are H, C1-C20 alkyl, cycloalkyl, alkenyl, aryl, arylalkyl, or alkylaryl.
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