Benzeneethanamine64-04-031 % similar Tryptamine61-54-131 % similar N-Acetyl-L-histidine2497-02-130 % similar 4-Phenylimidazole670-95-130 % similar 6-Fluorotryptamine575-85-930 % similar 5-Fluorotryptamine576-16-930 % similar Prezatide copper89030-95-530 % similar