You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (Z)-3-(2,5-dichloropyridin-4-yl)-2-[(E)-(dimethylhydrazinylidene)methyl]-3-hydroxyprop-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H15Cl2N3O3
assistant