Competitive inhibitor of cyclic AMP-dependent protein kinase I and II. Metabolic stability towards mammalian cyclic nucleotide- responsive phosphodiesterases. Discriminates between protein kinase A (antagonist) and some other cyclic AMP receptors, e.g. channels or CAP 3 (agonist). Membrane-permeant for several systems (for improved permeability more lipophilic analogues e.g. Rp-8-Br-cAMPS (BML-CN216) are recommended). Alternative name: Rp-cAMPS . Na, cAMPS . Na, Rp-Isomer. Purity: ≥99% (HPLC) (low adenosine, cAMP and Sp-cAMPS content). Appearance: White to off-white powder. Please keep in mind that equal amounts of the compound may look different in volume depending on humidity. Rp-cAMPS is hygroscopic and tends to form a transparent film on the bottom of the tube. Solubility: Soluble in water or aqueous buffers, DMSO, Methanol. Long Term Storage: -20°C.