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Analyte
CAS No.
Formula
Note
Structure
Hydroxychlorodenafil
1391054-
00-4
C
19
H
23
ClN
4
O
3
-
O
N
H
N
N
N
O
OH
Cl
Hydroxythiovardenafil
912576-30-
8
C
23
H
32
N
6
O
4
S
2
-
N
N
S
O
N
N
HN
S
O
N
O
HO
Imidazosagatriazinone
139756-21-
1
C
17
H
20
N
4
O
2
-
N
NH
N
N
O
O
Isosildenafil
253178-46-
0
C
22
H
30
N
6
O
4
S
-
N
HN
N
N
O
O
S
N
O O
N
N-Desethyl vardenafil
448184-46-
1
C
21
H
28
N
6
O
4
S
-
HN
N
S
O
N
N
HN
O
O
N
O
N-Desmethyl sildenafil
139755-82-
1
C
21
H
28
N
6
O
4
S
-
HN
N
S
O
O
O
N
HN
N
N
O
Candidates for 2016 Method of the Year
147