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Marinobufagin, which has the formula C 24 H 32 O 5 , is a 3,5‐dihydroxysteroid on the basis of chemical evidence. β‐Orientation of the C‐5 HO‐group can be deduced from molecular rotation differences between Marinobufagin and some of its derivatives. The spatial arrangement of the HO‐group at C‐3 is most probably the same 1 . Marinobufagin contains no tertiary hydroxyl at C‐14 and the fifth oxygen‐atom of this genin must be located in an oxide‐ring of unknown size, about which no precise statements can be made.
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Pataki et al. (1955) studied this question.
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