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 methyl (8S,11R,14S)-14-[[(2R)-4,8-dioxo-2-pentylnonanoyl]-methylamino]-3,11,18-trimethyl-10,13-dioxo-9-azatricyclo[13.3.1.12,6]icosa-1(18),2,4,6(20),15(19),16-hexaene-8-carboxylate .
user
C39H52N2O7
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