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Analyte
CAS No.
Formula
Note
Structure
Thiosildenafil
479073-79-
5
C
22
H
30
N
6
O
3
S
2
-
N
N
S
O
O
O
N
HN
N
N
S
Zaprinast
37762-06-4 C
13
H
13
N
5
O
2
-
O
N
H
N
N
H
N
N
O
Table 2015.12B. Gradient elution program
Time (min)
A (%)
B (%)
0.00
98
2
0.50
98
2
2.00
60
40
20.00
5
95
23.00
5
95
23.01
98
2
24.00
98
2
Candidates for 2016 Method of the Year
151