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 6-methyl-7-prop-2-enylspiro[2,3,6,8-tetrahydro-[1,4]dioxino[2,3-g]isoquinoline-9,1'-cyclopentane] .
user
C19H25NO2
assistant