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Analyte
CAS No.
Formula
Note
Structure
N-Desmethyl tadalafil
171596-36-
4
C
21
H
17
N
3
O
4
-
HN
N
O
O
NH
O
O
Nitrodenafil
147676-99-
1
C
17
H
19
N
5
O
4
-
O
N
H
N
N
N
O
NO
2
N-Octyl nortadalafil
1173706-
35-8
C
29
H
33
N
3
O
4
-
HN
N
O
O
N
O
O
Noracetildenafil
949091-38-
7
C
24
H
32
N
6
O
3
-
N
HN
N
N
O
O
O
N
N
Norneosildenafil
371959-09-
0
C
22
H
29
N
5
O
4
S
-
O
N
HN
N
N
O
S
N
O O
Candidates for 2016 Method of the Year
148