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Analyte
CAS No.
Formula
Note
Structure
Desmethylenetadalafil
171489-03-
5
C
21
H
19
N
3
O
4
-
HN
N
OH
HO
N
O
O
Dimethylsildenafil
496835-35-
9
C
23
H
32
N
6
O
4
S
-
HN
N
S
O
O
O
N
HN
N
N
O
Dimethylacetildenafil
Not
available
C
25
H
34
N
6
O
3
-
N
HN
N
N
O
O
O
N
HN
Dinitrodenafil
Not
available
C
17
H
18
N
6
O
6
-
O
N
N
N
N
OH
O
2
N
NO
2
Gendenafil
147676-66-
2
C
19
H
22
N
4
O
3
-
O
N
HN
N
N
O
O
Gisadenafil
334827-98-
4
C
23
H
33
N
7
O
5
S
-
N
S
O
N
N
H
N
O
O
N
N
O
OCH
3
N
Candidates for 2016 Method of the Year
146