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 4-naphthalen-1-yl-8-(naphthalen-1-ylmethylidene)-6-propyl-3,4,5,7-tetrahydro-1H-pyrido[4,3-d]pyrimidine-2-thione ?
user
C31H29N3S
assistant