5-[3-(Dimethylamino)propylidene]-5H-dibenzo[a,d]cyclohepten-3-ol; 3-Hydroxy Cyclobenzaprine (E / Z Mixture); Cyclobenzaprine 3-Hydroxy Impurity; Cyclobenzaprine Impurity 4; 3-Hydroxy Cyclobenzaprine(Z/E mixture); 5H-Dibenzo[a,d]cyclohepten-3-ol, 5-[3-(dimethylamino)propylidene]-; 3-Hydroxy Cyclobenzaprine (Mixture of Z and E Isomers)