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 (Z)-3-(2,3-dihydro-1,4-benzodioxin-6-yl)-2-(2,5-dimethyl-1-prop-2-enylpyrrole-3-carbonyl)prop-2-enenitrile .
user
C21H20N2O3
assistant