ITI-214 free base is a picomolar PDE1 inhibitor with excellent selectivity against other PDE family members and against a panel of enzymes, receptors, transporters, and ion channels, exhibits potent PDE1 inhibitory activity (Ki = 58 pM).
DSR-141562 is a new compound that can be taken orally and has a specific ability to inhibit phosphodiesterase 1 (PDE1) in the brain. This compound exhibits a preference for inhibiting human PDE1B, with an IC50 value of 43.9 nM. It also shows moderate inhibition of human PDE1A (IC50 = 97.6 nM) and PDE1C (IC50 = 431.8 nM). DSR-141562 is particularly useful in the study of positive symptoms, negative symptoms, and cognitive impairments associated with schizophrenia.