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 N-[(5R)-7,7-dimethyl-5,6,8,9-tetrahydrobenzo[7]annulen-5-yl]-3-methyl-[1,2,4]triazolo[4,3-b]pyridazin-6-amine ?
user
C19H23N5
assistant