1) Arsenical herbicide 
Cacodylic acid is the chemical compound with the formula (CH3)2AsO2H. Derivatives of cacodylic acid, cacodylates, were frequently used as herbicides. For example, `Agent Blue,` one of the chemicals used during the Vietnam War, is a mixture of cacodylic acid and sodium cacodylate. Sodium cacodylate is frequently used as a buffering agent in the p.....
(CH3)2AsO2H Molar mass: 137.99738
<chemical> An arsenical that has been used as a dermatologic agent and as an herbicide. ... Pharmacological action: dermatologic agents, herbicides. ... Chemical name: Arsinic acid, dimethyl- ... (12 Dec 1998) ... 
Type: Term Pronunciation: kak′ō-dil′ik as′id Definitions: 1. Arsenical contact herbicide that defoliates or desiccates a wide variety of plant species. Synonyms: dimethylarsinic acid
Cacodylic acid (alkargen) is a white, crystalline, deliquescent substance obtained by the oxidation of cacodyl. It has the properties of an exceedingly stable acid.