Carbaryl-d3 is a deuterated compound of Carbaryl. Carbaryl has a CAS number of 63-25-2. Carbaryl is a carbamate insecticide and parasiticide. It is a potent anticholinesterase agent belonging to the carbamate group of reversible cholinesterase inhibitors. It has a particularly low toxicity from dermal absorption and is used for control of head lice in some countries.