Novel compounds of formula ##STR1## wherein R.sup.1 represents a lower alkenyl group or R.sup.11, or taken together with R.sup.4 an oxo group; R.sup.11 represents hydrogen or a lower alkyl group; R.sup.2 represents hydrogen or a lower alkyl group; R.sup.3 represents methyl or methylene; R.sup.4 represents hydroxy or a loweralkoxy, lower alkenyloxy, loweralkoxyloweralkyl or acyloxy group and R.sup.5 represents hydrogen or, when simultaneously R.sup.3 represents methyl and R.sup.1 represents R.sup.11, taken together with R.sup.4 a 3.alpha. ,6-epoxide group, and 1,8.alpha.-dihydro-derivatives of compounds of formula I wherein R.sup.3 represents methyl and R.sup.5 represents hydrogen.
式为##STR1##的新化合物,其中R.sup.1表示较低的烯基或R.sup.11,或与R.sup.4一起表示氧代基; R.sup.11表示氢或较低的烷基; R.sup.2表示氢或较低的烷基; R.sup.3表示甲基或亚甲基; R.sup.4表示羟基或较低的烷氧基,较低的烯基氧基,较低的烷氧基较低的烷基或酰氧基,R.sup.5表示氢或当同时R.sup.3表示甲基和R.sup.1表示R.sup.11时,与R.sup.4一起表示3.alpha.,6-环氧基,以及式I的化合物的1,8.alpha.-二氢衍
生物,其中R.sup.3表示甲基,R.sup.5表示氢。