3-(cyclohexylamine)-2-hydroxy-1-propanesulfonic acid, commonly known as CAPSO, is an organic compound with the chemical formula C9H19NO4S and a molecular weight of 237.31 g/mol. The CAS number is 73463-39-5. CAPSO possesses both hydrophilic sulfonate groups and highly active hydroxyl groups. This dual property enables CAPSO to exhibit strong activity and broad application potential in chemical reactions. The sulfonate group endows CAPSO with excellent water solubility, while the hydroxyl group brings it abundant reaction possibilities, such as deprotection and substitution reactions.

1. Drilling fluid loss control material: CAPSO regulates the rheological and filtration properties of drilling fluids, which are essential for wellbore stability and cooling drill bits in oil and gas extraction.

2. Polymer functional monomers: In polymer synthesis, CAPSO helps construct responsive or water-soluble polymers. Its functional groups are valuable for applications in water treatment, nanomaterials, and specialized transfer systems.

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