You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (19S)-19-ethyl-7,19-dihydroxy-8-[[4-(methylamino)piperidin-1-yl]methyl]-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4(9),5,7,10,15(20)-heptaene-14,18-dione into molecular formula.
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C27H30N4O5
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