19-nor-1,24,25,28-tetrahydroxyvitamin D2
19-nor-1,24,25,28-tetrahydroxyvitamin D2 ??
??
19-nor-1,24,25,28-tetrahydroxyvitamin D2 C??? ??, ??, ??
19-nor-1,24,25,28-tetrahydroxyvitamin D2 ?? ?? ? ???
???
?? ??
19-nor-1,24,25,28-tetrahydroxyvitamin D2 ?? ??
???( 0)?? ??
