EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 672936 N-[(3,4-Dimethoxyphenyl)methyl]-4-methyl-octanamid Price on request 2539.8-100MG 4-Hydroxyisophthalic acid (4-Hydroxybenzene-1,3-dicarboxylic acid), neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 636-46-4 Price on request A15644950AL-100 Norethisterone, 100µg/mL in Acetonitrile, 1ml Price on request