GRO retention time marker

n-Nonane, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 111-84-2

alpha alpha alpha (20R,23R,24S)-4 alpha,23,24-Trimethylcholestane, neat, Solvent-neat, Unit ca. 5µg, # of units-1, Cas.no. 146276-33-7

Primisulfuron-methyl, 10.0 µg/ml, Acetonitrile,