You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[[(2S)-4-[6-(ethylcarbamoylamino)purin-9-yl]-2-(2-phenylethenyl)-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-6-yl]methylamino]methyl]benzoic acid by IUPAC nomenclature, provide its molecular formula.
user
C31H33N7O5
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