You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethane;7-methyl-3-methylidene-10H-pyrido[2,3-b][1,8]naphthyridine-2,8-diimine The above is the IUPAC name of a molecule. Write its SMILES notation.
user
C=C1C=C2C=C3C=C(C)C(=N)N=C3NC2=NC1=N;CC
assistant