4-Epioxytetracycline, 10mg

2,4'-DDD, 100 µg/ml, Ethyl acetate, 5ml

4-Hydroxyisophthalic acid (4-Hydroxybenzene-1,3-dicarboxylic acid), neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 636-46-4

Melamine (13C3,99%; Amino-15N3,98%) 100 µg/mL in Water, 1,2ml