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Analyte
CAS No.
Formula
Note
Structure
Tadalafil
171596-29-
5
C
22
H
19
N
3
O
4
Target
panel
HN
N
O
O
N
O
O
Thiohomosildenafil
479073-80-
8
C
23
H
32
N
6
O
3
S
2
Target
panel
N
N
S
O
O
O
N
HN
N
N
S
Udenafil
268203-93-
6
C
25
H
36
N
6
O
4
S
Target
panel
HN
S
O
N
HN
O
O
N
N
O
N
Vardenafil
224789-15-
5
C
23
H
32
N
6
O
4
S
Target
panel
N
N
S
O
N
N
HN
O
O
N
O
Aminotadalafil
385769-84-
6
C
21
H
18
N
4
O
4
-
HN
N
O
O
N
O
O
NH
2
Candidates for 2016 Method of the Year
144