AOAC Working Group Chair Orientation

Tadalafil Dichloro Impurity CAS No. N/A C22H18Cl2N2O5 M.W. 461.31 T-1030

Tadalafil Dimethoxy Impurity CAS No. 1356345-67-9 C23H23N3O4 M.W. 405.46 T-1031

Tadalafil Impurity (1,1 Œ- ethylidenebistryptophan) C24H26N4O4 M.W. 434.50 T-1032

Tadalafil Related Impurity 1 CAS No. N/A C26H25N3O4 M.W. 443.51 T-1033

Tadalafil Acid Impurity CAS No. N/A C19H16N2O4 HCl M.W. 336.35 36.46 T-1034

Chloropretadalafil C22H19ClN2O5 M.W. 426.86 T-104

N-Octyl-nortadalafil C29H33N3O4 M.W. 487.60 T-105

N-Butyl Tadalafil C25H25N3O4 M.W. 431.50 T-106

Nortadalafil C21H17N3O4 M.W. 375.39 T-107

Tadalafil Impurity A CAS No. NA C20H19N3O3 M.W. 349.39 T-108

Tadalafil Impurity B CAS No. NA C20H19N3O3 M.W. 349.39 T-109

Vardenafil Related Compounds (commercial standards available) – includes deuterated standards. 

Pseudovardenafil CAS No. 224788-34-5 C22H29N5O4S M.W. 459.57 V-051

Hydroxythio Vardenafil C23H32N6O4S2 M.W. 520.68 V-0510

Vardenafil Impurity 1 CAS No. 1417529-67-9 C17H18N4O4 M.W. 342.36 V-0511

Vardenafil Impurity 2 CAS No. 1417529-69-1 C23H30N6O6S M.W. 518.60 V-0512

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