9,10-Secocholesta-(5Z)-5,8(14),10(19)-triene-3β-ol and 18-Nor-14β-methyl-9,10-secocholesta-(5E)-5,10(19),13(17)-trien-3β-ol, two new double bond isomers of vitamin D3. Structural modifications of vitamin D3: 5. Communication

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