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(3 beta,5Z,7E)-9,10-Secocholesta-5,7,10(19)-trien-3-ol

Derivative of 7-dehydroxycholesterol formed by Ultraviolet Rays breaking of the C9-C10 bond. It differs from ERGOCALCIFEROL in having a single bond between C22 and C23 and lacking a methyl group at C24.