Table 1

Physiochemical properties of compounds A and B

Compound ACompound B
Molecular weight422412
m log P (Moriguchi, 1994)5.94.5
pk a 92
H-bond donors13
H-bond acceptors58
Nonspecific microsomal bindingHighLow

The m log P and H-bond acceptor and donor numbers were calculated as reported previously. Reported pKa values reflect that of the primary ionizable moieties (i.e., compound A contains a primary amine and compound B contains a carboxylic acid moiety).