You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-2-amino-2-phenylacetic acid;(2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-2-phenylacetic acid;sulfane by IUPAC nomenclature, provide its molecular formula.
user
C21H30N2O6S2
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