39 / 63
V
aclavik
et al
.:
J
ournal of
AOAC I
nternational
V
ol
.
99, N
o
.
1, 2016
63
Analyte
Chemical Abstracts Service No.
Formula
Note
Structure
Pyrazole
N
-demethyl
sildenafil
139755-95-6
C
21
H
28
N
6
O
4
S
—
Pyrazole
N
-demethyl
sildenafil-
d
3
Not available
C
21
H
25
D
3
N
6
O
4
S
IS
Sildenafil
N
-oxide
1094598-75-0
C
22
H
30
N
6
O
5
S
—
Thioaildenafil
856190-47-1
C
23
H
32
N
6
O
3
S
2
—
Thiosildenafil
479073-79-5
C
22
H
30
N
6
O
3
S
2
—
Zaprinast
37762-06-4
C
13
H
13
N
5
O
2
—
a
— = Additional evaluated analytes.
Table 2. (
continued
)
39