You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2S)-2-[[5-[(2,4-diamino-5-propylpyrido[2,3-d]pyrimidin-6-yl)methylamino]thiophene-2-carbonyl]amino]pentanedioic acid .
user
C21H25N7O5S
assistant