| abstract |
(57) [Problem] To provide a novel active vitamin D derivative and a drug as a differentiation inducer. SOLUTION: This novel active vitamin D derivative has the following general formula (I): Wherein, the R 1 and R 2 represents a methyl group or COOR 3, both without simultaneously represent a methyl group, R 3 Represents a hydrogen atom or a (C 1 -C 3 ) alkyl group], has a strong differentiation-inducing action, and is useful as a differentiation-inducing agent. |