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system
Provide the molecular formula for the IUPAC named substance methyl 15-ethylidene-12-(17-ethyl-7-methoxy-3,13-diazapentacyclo[13.3.1.02,10.04,9.013,18]nonadeca-2(10),4,6,8-tetraen-6-yl)-17-methyl-10,17-diazatetracyclo[12.3.1.03,11.04,9]octadeca-3(11),4,6,8-tetraene-18-carboxylate .
user
C41H50N4O3
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