Aflatoxin G2-13C17 is intended for use as an internal standard for the quantification of aflatoxin G2by GC- or LC-MS. Aflatoxin G2is a mycotoxin that has been found inAspergillus.1It is lethal to ducklings (LD50= 2.83 mg/kg)but is non-toxic to rats when administered at a dose of 200 mg/kg.2