In-depth prevention and warning

Drug warning

Do not take tadalafil if you are allergic to any of its contents; If you are taking nitrates (for angina), Riociguat (for pulmonary hypertension) or alpha-blockers; If you have heart problems or stroke, low blood pressure or uncontrolled high blood pressure, if you have ever been blind. Tell your doctor before taking… Continue

Aniline is mainly used to prepare methylene diphenylamine and related compounds by condensation with formaldehyde. The condensation of diamine with phosgene yields methylene diphenyl diisocyanate, which is the precursor of polyurethane polymers.

Other uses include rubber-processing chemicals (9 percent), herbicides (2 percent) and dyes and pigments (2 percent). As additives of rubber, aniline…

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Sulfamic acid is primarily a precursor of sweet compounds. It reacts with cyclohexylamine, and then NaOH is added to get C6H11NHSO3Na, cyclamate. Related compounds are also sweeteners, such as potassium acetosulfonate.

Sulfonates have been used in the design of a wide range of therapeutic agents, such as antibiotics, nucleoside/nucleotide human immunodeficiency virus (HIV) reverse…

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Melamine is a triamine compound that was first discovered and synthesized in the early 1800s. It is deaminated to the oxytriazine structural analogues Ammeline, Ammelide, and cyanuric acid. Melamine is a chemical compound used in a variety of materials used in cleaning products, dry wipe boards and plastics, among other applications. Melamine is synthesized from urea, requires several purification…

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Sodium sulfate is produced on a very large scale as a by-product of several important industrial processes. In many cases, disposal of this material is difficult. As a result, there have been many efforts to use electrolytic salt splitting to recover both sulfuric acid and sodium hydroxide. Because of major technical and economic problems, none of these efforts has been successful. The…

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