Solvent | Tautomeric composition, %, (48 h after dissolution) | ||
Form E,E'-A | Form E,Z'-A | Form B | |
Solid phase | ? | 100 | ? |
CDCl3 | ? | 100 | ? |
Pyridined5 | 16 | 71 | 13 |
DMFd7 | 8 | 58 | 34 |
DMSOd6 | 9 | 56 | 35 |