You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-methyl-7-(2-oxa-9-azaspiro[4.5]decan-9-ylmethyl)-[1,3]thiazolo[3,2-a]pyrimidin-5-one .
user
C16H21N3O2S
assistant