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-[[2-(8lambda4-thia-7,9-diazabicyclo[4.3.0]nona-1(6),2,4,7,8-pentaen-2-ylamino)-2-oxoethyl]amino]-N-prop-2-enylbenzamide .
user
C18H17N5O2S
assistant