You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-hydroxypropan-2-yl)-4-methoxy-7-methyl-2,3,6,7-tetrahydrofuro[3,2-h]isochromen-9-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H20O5
assistant