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pK a values were calculated in water using a SPARC pK a calculator, http://archemcalc.com/sparc/test/login.cfm (accessed 16 February 2014).
| pK a | pK a | Cocrystal/salt | |
|---|---|---|---|
| ACM | 3.57 | ||
| NAM | 3.31 | 0.26 | Cocrystal |
| INA | 4.17 | 0.6 | Cocrystal |
| PAM | 2.95 | 0.62 | Cocrystal |
| CPR | 0.90 | 2.67 | Cocrystal |
| PABA | 2.41 | 1.16 | Cocrystal |
| PPZ | 9.72 | 6.15 | Salt |
