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Analyte
CAS No.
Formula
Note
Structure
Propoxyphenyl
thiohydroxyhomosildenafil
479073-90-
0
C
24
H
34
N
6
O
4
S
2
-
NH
N
N
N
O
S
N
O O
N
OH
S
Pseudovardenafil
224788-34-
5
C
22
H
29
N
5
O
4
S
-
N
S
O
N
N
HN
O
O
N
O
Pyrazole N-demethyl
sildenafil
139755-95-
6
C
21
H
28
N
6
O
4
S
-
N
N
S
O
O
O
N
HN
N
H
N
O
Pyrazole N-demethyl
sildenafil-
d
3
Not
available
C
21
H
25
D
3
N
6
O
4
S ISTD
N
N
S
O
O
O
N
HN
N
H
N
O
D
D D
Sildenafil N-oxide
1094598-
75-0
C
22
H
30
N
6
O
5
S
-
N
+
N
S
O
O
O
N
HN
N
N
O
O
-
Thioaildenafil
856190-47-
1
C
23
H
32
N
6
O
3
S
2
-
N
H
N
N
N
S
O
S
N
O O
HN
Candidates for 2016 Method of the Year
150