(o-Phenylenebis(methylidynedithio))tetraacetic acid 51865-21-5 ACETIC ACID, (o-PHENYLENEBIS(METHYLIDYNEDITHIO))TETRA- Acetic acid, 2,2',2'',2'''-(1,2-phenylenebis(methylidynebis(thio))tetrakis- BRN 2030067 PTTA Phthalyltetrathioacetic acid