You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[(2R)-1-[(2-methylimidazo[1,2-a]pyridin-3-yl)methyl]piperidin-2-yl]-5-thiophen-3-yl-1,3,4-oxadiazole by IUPAC nomenclature, provide its molecular formula.
user
C20H21N5OS
assistant