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 7-(5-butan-2-ylthiophen-2-yl)-5-[5-(2-methylbutan-2-yl)thiophen-2-yl]-2,3-diphenylthieno[3,4-b]pyrazine .
user
C35H34N2S3
assistant