An object of the present invention is to provide a chemical liquid purification method which makes it possible to obtain a chemical liquid having excellent defect inhibition performance. Another object of the present invention is to provide a chemical liquid. The chemical liquid purification method according to an embodiment of the present invention is a chemical liquid purification method including obtaining a chemical liquid by purifying a substance to be purified containing an organic solvent, in which a content of the stabilizer in the substance to be purified with respect to the total mass of the substance to be purified is equal to or greater than 0.1 mass ppm and less than 100 mass ppm.

The present disclosure provides treprostinil derivatives that can act as prodrugs of treprostinil. The treprostinil derivatives can be used to treat any conditions responsive to treatment with treprostinil, including pulmonary hypertension, such as pulmonary arterial hypertension.

The present disclosure provides treprostinil derivatives that can act as prodrugs of treprostinil. The treprostinil derivatives can be used to treat any conditions responsive to treatment with treprostinil, including pulmonary hypertension, such as pulmonary arterial hypertension.

The present disclosure provides treprostinil derivatives that can act as prodrugs of treprostinil. The treprostinil derivatives can be used to treat any conditions responsive to treatment with treprostinil, including pulmonary hypertension, such as pulmonary arterial hypertension.

The present disclosure provides treprostinil derivatives that can act as prodrugs of treprostinil. The treprostinil derivatives can be used to treat any conditions responsive to treatment with treprostinil, including pulmonary hypertension, such as pulmonary arterial hypertension.

The present invention relates to a process for the preparation of aqueous solutions of [1-.sup.13C]-hyperpolarized carboxylate containing molecules of diagnostic interest that comprises parahydrogenating with molecular para-hydrogen unsaturated alkenyl or alkynyl esters of the concerned .sup.13C-carboxylate molecules.

The present invention relates to a process for the preparation of aqueous solutions of [1-.sup.13C]-hyperpolarized carboxylate containing molecules of diagnostic interest that comprises parahydrogenating with molecular para-hydrogen unsaturated alkenyl or alkynyl esters of the concerned .sup.13C-carboxylate molecules.

The invention relates to mixtures having: components (a) having at least one fragrance of the formula (I) ##STR00001## where R1=OCR2, CH.sub.2OR3, C1-C8 open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, with R2=an open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, having 2-10 C atoms, with R3=an open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, having 1-8 C atoms, and components (b) having at least one fragrance, different from the fragrances of component a,
characterized in that the weight ratio of all components (a) to all components (b) is from 1:10 to 1:10000.

The invention relates to mixtures having: components (a) having at least one fragrance of the formula (I) ##STR00001## where R1=OCR2, CH.sub.2OR3, C1-C8 open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, with R2=an open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, having 2-10 C atoms, with R3=an open-chain or branched aliphatic radical, optionally substituted and/or unsaturated, having 1-8 C atoms, and components (b) having at least one fragrance, different from the fragrances of component a,
characterized in that the weight ratio of all components (a) to all components (b) is from 1:10 to 1:10000.

Methods and systems for producing alkyl hydroxyalkanoate from hydroxy carboxylic acid recovery bottoms. The methods generally comprise the steps of obtaining a hydroxy carboxylic acid recovery bottom, adding a mono-alcohol to the hydroxy carboxylic acid recovery bottom to obtain a first mixture, heating the first mixture in the presence of a catalyst to form a reaction product, distilling the reaction product, and recovering an alkyl hydroxyalkanoate fraction.