124-58-3 2321-53-1 Ammonium hydrogen methylarsonate Ammonium methanearsonate Ansar 157 Arsonic acid, methyl-, monoammonium salt Caswell No. 580C EPA Pesticide Chemical Code 013808 MAMA METHANEARSONIC ACID, MONOAMMONIUM SALT Methanearsonic acid, ammonium salt Methylarsonat monoamonny [Czech] Methylarsonic acid ammonium salt Monoammonium methanearsonate USAF AN-16