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 (3R)-5-ethyl-7a-hydroxy-3,6-dimethyl-4-[(E)-2-(5-thiophen-2-ylpyridin-2-yl)ethenyl]-3,3a,4,5,6,7-hexahydro-2-benzofuran-1-one .
user
C23H27NO3S
assistant