above ph 7 , the degradation was superseded by the ester hydrolysis to carbenicillin , beta-lactams of both prodrugs are around three times more stable than carbenicillin disodium at ph 1 , six times at ph 2 , and 17 times at ph 3 .
C0006976
carbenicillin
C0813202
carbenicillin disodium