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 4-[(E)-(3-oxo-4a,5,6,7,8,8a-hexahydro-4H-benzo[b][1,4]thiazin-2-ylidene)methyl]-N-(4-phenylbutan-2-yl)benzamide .
user
C26H30N2O2S
assistant