Hello,

I am still trying to separate the Tranexamic Acid and I am asking if you consider the Norvaline a good internal standard to use, viewing the following properties

Tranexamic Acid http://www.drugbank.ca/drugs/DB00302
Norvaline http://www.drugbank.ca/drugs/DB04185

Property TRANEXAMIC ACID NORVALINE
water solubility 1.82e+01 g/l 2.12e+02 g/l
logP -1.4 -2
logP -1.6 -1.9
logS -0.94 0.26
pKa (strongest acidic) 4.56 2.71
pKa (strongest basic) 10.22 9.53
physiological charge 0 0
hydrogen acceptor count 3 3
hydrogen donor count 2 2
polar surface area 63.32 63.32
rotatable bond count 2 3
refractivity 41.9 29.62
polarizability 17.28 12.51

Thank you