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 (3Z)-3-[(2E)-2-[7a-methyl-1-[(2R)-4-propan-2-ylsulfinylbutan-2-yl]-2,3,3a,5,6,7-hexahydro-1H-inden-4-ylidene]ethylidene]-2-methylidenecyclohexan-1-one;ethane .
user
C28H46O2S
assistant