1980-93-4 Color Precursor No. 21 Yellow Color precursor X-4405 NSC 328474 Phenol, 4-(2-(3,3-dimethyl-3H-indol-2-yl)ethenyl)- Phenol, p- 2-(3,3-dimethyl-3H-indol-2-yl)vinyl - Phenol, p-(2-(3,3-dimethyl-3H-indol-2-yl)vinyl)- p-(2-(3,3-Dimethyl-3H-indol-2-yl)vinyl)phenol