| 摘要 |
Title cpds. have the formula (where R1 and R2 are H, halogen, CF3, lower alkoxy opt. substd. lower alkylthio or alkyl, sulphonamido opt. substd. dialkylamino or acylamino; A is 2-5C alkylene opt. alkyl-substd; B is H or lower alkyl or aralkyl or together with C is 2-6C alkylene opt. interrupted by 1-2 hetero-atoms; C is lower alkyl or aralkyl; R is H or lower alkyl; Y is H, OH or lower alkoxy or acyloxy, or Y and Z together are O or alkylenedioxy (dithio or oxythio) where alkylene is 2-4C, or Y and X form a double bond; Z is H or lower alkyl or alkoxy, or Z and Y together are O or alkylenedioxy (dithio or oxythio); X is H or X and Y form a double bond; Z1 is H or lower alkyl).
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