You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Please write the molecular formula of the molecule methyl (4R)-4-[(3R,5R,7R,8R,9S,10S,12S,13R,14S,17R)-7-amino-3-azido-10,13-dimethyl-12-[(2-methylpropan-2-yl)oxycarbonylamino]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate .
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C30H51N5O4
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