You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (1R,9R,10S,11R,19S)-11-acetyloxy-13-ethyl-4-[(12S,14S)-16-ethyl-12-methoxycarbonyl-6-[(E)-3-oxohex-1-enyl]-1,10-diazatetracyclo[12.3.1.03,11.04,9]octadeca-3(11),4(9),5,7,15-pentaen-12-yl]-10-hydroxy-5-methoxy-8-methyl-8,16-diazapentacyclo[10.6.1.01,9.02,7.016,19]nonadeca-2,4,6,13-tetraene-10-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C51H62N4O9
assistant