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 identified by 2-bromo-5-tert-butylpyrimidine;2-tert-butyl-5-but-2-ynoxypyrazine;2-tert-butyl-5-[(2S)-but-3-yn-2-yl]oxypyrazine;2-tert-butyl-5-chloropyrazine;2-tert-butyl-5-(2-cyclopropylethynyl)pyrazine;2-tert-butyl-5-(2-cyclopropylethynyl)pyridine;2-tert-butyl-5-ethynylpyrazine;2-tert-butyl-5-isocyano-3-methylpyridine;2-tert-butyl-5-isocyanopyrazine;5-tert-butyl-2-isocyanopyridine;2-tert-butyl-5-(oxetan-3-yl)pyridine;2-tert-butyl-5-prop-2-ynoxypyrazine;2-tert-butyl-5-prop-1-ynylpyrazine ?
user
C141H181BrClN25O4
assistant