You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4R,7S,10S,13S,16S,19S,22S,25S,28R)-28-acetamido-7,25-bis(3-amino-3-oxopropyl)-16-[3-(diaminomethylideneamino)propyl]-10,22-bis(hydroxymethyl)-13-[(4-hydroxyphenyl)methyl]-19-(1H-indol-3-ylmethyl)-6,9,12,15,18,21,24,27-octaoxo-1,2-dithia-5,8,11,14,17,20,23,26-octazacyclononacosane-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C50H70N16O15S2
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