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CAPS

Chemical compound
CAPS is the common name for N-cyclohexyl-3-aminopropanesulfonic acid, a chemical used as buffering agent in biochemistry. The similar substance N-cyclohexyl-2-hydroxyl-3-aminopropanesulfonic acid is also used as buffering agent in biochemistry.... Wikipedia
Molar mass: 221.32 g/mol
Formula: C9H19NO3S
Acidity (pKa): 10.4
Melting point: >300 °C