You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3Z)-3-[(3Z)-2-methylidenehexa-3,5-dienylidene]-7,8-didehydro-2,5,5a,6,9,9a,10,10a-octahydro-1H-pyrrolo[1,2-b]isoquinoline ?
user
C19H23N
assistant