CAPSO, or 3-(Cyclohexylamino)-2-hydroxy-1-propanesulfonic acid, is a zwitterionic buffer compound that is commonly used in biochemical and molecular biology applications.

PIPES, or Piperazine-N,N'-bis(2-ethanesulfonic acid), is a widely used buffer compound in biochemical and molecular biology applications.

PIPES-2Na, or Piperazine-N,N'-bis(2-ethanesulfonic acid) disodium salt, is a salt form of the PIPES buffer compound.