Product nomen:3,5-Diiodo-l-Thyronine / T2 Alias: T2, TT, Thyrotabs CAS: 1041-01-6 MF: C15H13I2NO4 MW: 525.08 EINECS: 213-867-7 Aspectus: Off-White powder Usage: treatment of congenital or drug-induced hypothyroidism.