Purvalanol B(NG-95) is a cyclin-dependent kinase inhibitor with IC50 values of 6, 6, 9, > 10,000, and 6 nM for cdc2/cyclin B, cdk2/cyclin A, cdk2/cyclin E, cdk4/cyclin D1 and cdk5-p35 respectively.

Purmorphamine, which directly binds and activates Smoothened, blocks BODIPY-cyclopamine binding to Smo with IC50 of ~ 1.5 μM and also is an inducer of osteoblast differentiation with EC50 of 1 μM.

PTC-209 is a specific inhibitor for BMI-1 with IC50 of 0.5 uM in in both GEMS reporter and ELISA assays.

PTC-209 is a specific inhibitor for BMI-1 with IC50 of 0.5 uM in in both GEMS reporter and ELISA assays.

PTC124 (Ataluren) is a potent nonsense mutation inhibitor with EC50 of ~0.1 μM.

PT2385 is an orally active, small molecule inhibitor of hypoxia inducible factor (HIF)-2alpha, with potential antineoplastic activity.

PSI-7977 is an investigational nucleotide analog currently in Phase 2 for treatment of chronic HCV infection.

PSI-6130(R 1656) is a Hepatitis C Virus Nucleoside Inhibitor. PSI-6130(R 1656) is useful for Antiviral agents.

PRT4165 is a potent inhibitor of PRC1 (Polycomb-repressive complex 1)-mediated H2A ubiquitylation.

Proguanil is an antimalarial prodrug that is metabolized to the active metabolite cycloguanil, a dihydrofolate reductase (DHFR) inhibitor.

PRIMA-1MET is methylated derivative of PRIMA-1. It can restore mutant p53 activity.

Preladenant(SCH 420814) is a potent and selective antagonist at the adenosine A2A receptor.

PRE-084 hydrochloride is a high affinity, selective σ1 agonist (Ki values are 2.2 and 13091 nM for σ1 and σ2 receptors respectively).

Praliciguat (IW-1973, IW1973) is a potent, orally available sGC stimulator that concentration-dependently increases the production of cGMP with EC50 of 267 nM.

Pracinostat(SB939) is a potent pan-HDAC inhibitor with IC50 of 40-140 nM with exception for HDAC6; has no activity against the class III isoenzyme SIRT I.

PR-619 is a broad-range DUB inhibitor with potential for further development as a chemotherapeutic agent in cancer therapy.

PPQ-102 is a potent CFTR inhibitor which can completely inhibited CFTR chloride current with IC 50approximately 90 nM.

PP242 is a selective mTOR inhibitor with IC50 of 8 nM; targets both mTOR complexes with >10- and 100-fold selectivity for mTOR than PI3Kδ or PI3Kα/β/γ, respectively; also showed slightly weaker activity against BRD4 (Kd= 1.7 uM).

PP2 is Src family kinase inhibitor, potently inhibits Lck/Fyn with IC50 of 4 nM/5 nM, ~100-fold less potent to EGFR, inactive for ZAP-70, JAK2 and PKA.

PP2 analog is the analog of PP2,a Src family kinase inhibitor.

PP1 is a potent and selective Src inhibitor for Lck/Fyn with IC50 of 5 nM/ 6 nM.

Poziotinib, is an orally bioavailable, quinazoline-based pan epidermal growth factor receptor (EGFR or HER) inhibitor with potential antineoplastic activity.

Potent, selective CB1 cannabinoid receptor antagonist/inverse agonist (Ki values are 12 and 4200 nM for CB1 and CB2 receptors respectively). Increases locomotor activity following systemic administration in vivo. Analog of SR141716A (Ki = 14 nM).

Potent phosholipase D (PLD) inhibitor (IC50 values are 20 and 25 nM for PLD2 and PLD1 respectively).

Potent and selective inhibitor of the TGF-β type I receptor/ALK5 (IC50 = 2.5 nM). Exhibits ~ 5000-fold selectivity over p38 MAPK. Suppresses development of renal fibrosis in a unilateral ureteral obstruction model. Also reduces proteinuria, glomeruloscler

Ponesimod(ACT-128800) is an orally active, selective sphingosine-1-phosphate receptor 1 (S1P1) immunomodulator with EC50 of 5.7 nM.

PNU-120596 is a positive allosteric modulator of α7 nAChR with EC50 of 216 nM.

PND-1186 is a potent FAK inhibitor with IC50 of 1.5 nM.

PLX4720 is a potent and selective inhibitor of B-RafV600E with IC50 of 13 nM, equally potent to c-Raf-1(Y340D and Y341D mutations), 10-fold selectivity for B-RafV600E than wild-type B-Raf.

PLX4032 (Vemurafenib, RG7204, Zelboraf, RO5185426) is a novel and potent inhibitor of B-RafV600E with IC50 of 31 nM.