Solvent | Tautomeric composition, %, (48 h after dissolution) | ||
Form E,E'-A | Form E,Z'-A | Form B | |
Solid phase | ? | ? | 100 |
CDCl3 | ? | 30 | 70 |
Pyridined5 | 6 | 37 | 57 |
DMFd7 | 10 | 46 | 44 |
DMSOd6 | 12 | 61 | 27 |