Table:
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 omeprazole
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
-

Statement: rabeprazole binds to cysteine 813, 892, and 321.
Question: what is the number of rabeprazole bind to cysteine?
Answer: 813, 892 and 321