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Analyte
CAS No.
Formula
Note
Structure
Norneovardenafil
358390-39-
3
C
18
H
20
N
4
O
4
-
N
N
HN
O
N
O
O
OH
Nortadalafil
Not
available
C
21
H
17
N
3
O
4
-
HN
N
O
O
NH
O
O
Piperiacetildenafil
Not
available
C
24
H
31
N
5
O
3
-
O
N
NH
N
N
O
O
N
Propoxyphenyl sildenafil
Not
available
C
23
H
32
N
6
O
4
S
-
NH
N
N
N
O
O
S
O N
O
N
Propoxyphenyl
thiosildenafil
479073-87-
5
C
23
H
32
N
6
O
3
S
2
-
NH
N
N
N
O
S
N
O O
N
S
Candidates for 2016 Method of the Year
149