Synonyms: Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide; 2,4,6-Trimethylbenzoyldiphenyl Phosphine Oxide; 2,4,6-Trimethylbenzoyldiphenylphosphine oxide; TPO; 2,4,6-Trimethylbenzoyldi-Phenylphosphinoxid; 2,4,6-Trimethylbenzoyldi-Phenylphosphinoxid; TPO; Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide; Photoinitiator-TPO