Methanedithiol

Methanedithiol is an organosulfur compound with the formula H2C(SH)2. A seldom used chemical, it form when formaldehyde reacts with hydrogen sulfide under pressure:
 * CH2O + 2 H2S  ->  H2C(SH)2  +  H2O

This reaction competes with formation of trithiane:
 * 3 H2C(SH)2 -> [H2CS]3  +  3 H2S

Methanedithiol forms a solid dibenzoate derivative upon treatment with benzoic anhydride:
 * 3 H2C(SH)2 + 2 (C6H5CO)2O  ->  H2C[SC(O)C6H5]2  + 2 C6H5CO2H

Methanetrithiol is also known.