You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 5-[7-[hydroxy-[(5-methyl-1,3,4-oxadiazol-2-yl)methylamino]methyl]-3-prop-2-ynylquinoxalin-2-yl]pentanoic acid ?
user
C21H23N5O4
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