L-Cystine

(±)-Atenolol,100 µg/mL,MeOH,1mL,

Ethylenethiourea, 1000µg/ml in Ethylacetate, 1ml

Metoxuron-d6 (N,N-dimethyl-d6),100 µg/mL,acetonitrile,1mL,