Properties: White solid (...). Moderately soluble in water; soluble in most organic solvents except hydrocarbons. Hazard: Highly toxic. A cholinesterase inhibitor. Use may be restricted. Use: Insectic, generic name for a systemic insecticide that acts by inhibiting cholinesterases, enzymes involved in transmitting nerve impulses. Chemically, it is an organophosphate. Like all organophosphates it is