You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1S,2S,6Z,10S,11S,16Z)-6-butylidene-16-[(3S)-3-methyl-4-(methylamino)butylidene]-12-(2H-pyrrol-4-ylmethyl)-5,15-dioxapentacyclo[9.5.2.01,13.02,10.03,7]octadeca-3(7),12-diene-4,14-dione .
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C31H38N2O4
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