3-Carboxyumbelliferyl beta-D-galactopyranoside (CAS NO.64664-99-9) is also named as CUG ; 3-Carboxyumbelliferyl B-D-galactopyranoside ; 3-Carboxyumbelliferyl-D-galactopyranoside ; Carboxyumbelliferyl--D-Galactopyranoside(CUG) .