Prometryn is a diamino-1,3,5-triazine that is N,N’-di(propan-2-yl)-1,3,5-triazine-2,4-diamine substituted by a methylsulfanediyl group at position 6. It has a role as a herbicide, a xenobiotic and an environmental contaminant. It is a diamino-1,3,5-triazine and a methylthio-1,3,5-triazine.