An Update on Ligands for Prostanoid Receptors33]
and carbacyclin (6a-carba PGI2; Prod. No. C 3305)) [34].
Recently, a 6-oxo PGE1 analog, ONO-DI-004, has been
described as an EP1-selective agonist [35,36].
The first EP1 antagonist was the dibenzoxazepine-hydrazide