This image of a simple structural formula is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Compound
Substituents
Form
Cysteine binding
pKa
First approval
X
R1
R2
R3
R4
pKaa1
pKaa1
year
Omeprazole
CH
OCH3
CH3
CH3
CH3
Racemic mixture
813 and 892
4.06
0.79
1989 in USA
Esomeprazole
CH
OCH3
CH3
CH3
CH3
(S)-(−)-enantiomer of lansoprazole
813 and 892
4.06
0.79
2001 in USA
Lansoprazole
CH
H
CH3
CH2CF3
H
Racemic mixture
813 and 321
3.83
0.62
1991 in Europe
Dexlansoprazole
CH
H
CH3
CH2CF3
H
(R)-(+)-enantiomer of lansoprazole
813 and 321
3.83
0.62
2009 in USA
Pantoprazole
CH
OCHF2
OCH3
CH3
H
Racemic mixture
813 and 822
3.83
0.11
1994 in Germany
Rabeprazole
CH
H
CH3
(CH2)3OCH3
H
Racemic mixture
813, 892 and 321
4.53
0.62
1999 in USA
Tenatoprazole
N
OCH3
CH3
CH3
CH3
Racemic mixture
813 and 822
4.04
–0.12
—
W3C-validity not checked.
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