You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2S,3aS,6aS)-1-[(2S)-2-[[(1S)-1-carboxy-2-phenylethyl]amino]propanoyl]-3,3a,4,5,6,6a-hexahydro-2H-cyclopenta[b]pyrrole-2-carboxylic acid using the IUPAC nomenclature.
user
C20H26N2O5
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