Acylsulphonamide analogues of the meta-tolylurea L-708,474 have been s
ynthesised and evaluated as CCKB receptor antagonists. Such derivative
s retain very high affinity and subtype selectivity for the CCKB recep
tor, and have good aqueous solubility. The ortho-tolyl acylsulphonamid
e L-736,309 is orally bioavailable and brain penetrant in rat.