the in vitro bone-resorbing activity of 25-hydroxy-6,19-epoxyvitamin d3 ( 6a ) and 25- ( oh ) d3 endoperoxide ( 2a ) was higher than that of 25-hydroxyvitamin d3 ( 1a ) , indicating that the differentiating activity also paralleled the bone-resorbing activity in these vitamin d derivatives .
C2713074
25
C0006657
25-hydroxyvitamin d3