O-ethyl-S-n-butyl-O-(2- or 3-nitrophenyl) phosphorothiolates
 Nitrophenylthiolphosphoric esters of the formula ##STR1## wherein R.sub.1 represents methyl or ethyl, PA1 R.sub.2 represents propyl or butyl, and PA1 R.sub.3 represents hydrogen, methyl or chlorine, Processes for their manufacture and their use in pest control a novel composition of reduced mammaliam toxicity. 
Ciba-Geigy AG
A C
A01N C07F
inventional inventional
Alexis A. Paul L.
Oswald Valint