You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (E)-3-[5-[[(3R)-1-[(3-propan-2-yloxyphenyl)methyl]pyrrolidin-3-yl]amino]pyrazin-2-yl]prop-2-enoic acid ?
user
C21H26N4O3
assistant