You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-methyl-2-[[10-(1-methylpiperidin-4-ylidene)-4H-thieno[3,2-c][1]benzoxepin-8-yl]sulfanyl]propanoic acid ?
user
C22H25NO3S2
assistant