Crystal and molecular structure of 1,2,3,4,4aβ,5,6,7,7a,8,8a,9,9aβ,9b-tetradecahydro-4α,7aβ,9bα-trimethyl-6a, 8-methano-6aH-cyclopropa[b]phenanthrene-4-carboxylic acid
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