Organophosphate is a group of compounds, not a single compound. It's like stopping at acropora when IDing 
Here's a brief Background taken from:
http://www.emedicine.com/med/topic1677.htm
Eeks nerve gas

Here's a brief Background taken from:
http://www.emedicine.com/med/topic1677.htm
Organophosphate (OP) compounds are a diverse group of chemicals used in both domestic and industrial settings. Examples of OPs include insecticides (malathion, parathion, diazinon, fenthion, dichlorvos, chlorpyrifos), nerve gases (soman, sarin, tabun, VX), ophthalmic agents (echothiophate, isoflurophate), and antihelmintics (trichlorfon). Herbicides (tribufos [DEF], merphos) are tricresyl phosphateââ"šÂ¬Ã¢â‚¬Å“containing industrial chemicals
Eeks nerve gas