Chiral standards are  used in the chiral chromatography to measure to measure the difference in the absorption coefficients between left handed and right handed cicularly polarized light.

CAS Number
581772-29-4 (free base); 929540-41-0 (Ca salt) ; 862260-38-6 (Na salt)
CAS Number
887196-24-9
Alternate CAS Number
1105067-87-5(Ca Salt);1371615-56-3(Na Salt)
CAS Number
873950-17-5
Alternate CAS Number
1316291-19-6(Sodium Salt); NA(calcium salt)
CAS Number
887324-53-0
Alternate CAS Number
887196-29-4(Ca Salt)
CAS Number
1105067-88-6(ca salt)
Alternate CAS Number
1428118-38-0(Na Salt); 501121-34-2(Freebase)
CAS Number
433289-84-0
Alternate CAS Number
433289-83-9(Ca Salt);1516864-05-3(sodium salt)
CAS Number
693794-20-6
Alternate CAS Number
693793-53-2(Ca Salt);1807481-00-0(sodium salt)
CAS Number
134523-00-5
Alternate CAS Number
134523-03-8(Ca Salt);344423-98-9(Trihydrate - salt);357164-38-6(Calcium Hydrate Salt);134523-01-6(Sodium Salt);1072903-92-4(strontium salt);1072903-93-5(Strontium Pentahydrate salt)