Abstract: The invention relates to the field of chemical and pharmaceutical industry and medicine and concerns compounds which can be used to produce agents for the treatment of cardiovascular diseases. The use of 2-[2-cyano-2-[5-(hydroxymethyl)-3-methyl-1,3-oxazolidin-2-ylidene]ethylidene]indolin-3-one of formula I is proposed as a biologically active compound exhibiting the properties of exogenous nitric oxide donor, a platelet aggregation inhibitor, also exhibiting antihypertensive activity and activating activity towards the soluble guanylate cyclase enzyme. Variants of methods for synthesizing the above compound are also proposed.