You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[5-(cyclopropylmethyl)-1,3,4-thiadiazol-2-yl]cyclopentanecarboxamide;(2S)-2-ethylpentanoic acid into molecular formula.
user
C19H31N3O3S
assistant