In the structure of (6R*,11R*)-5-acetyl-11-ethyl-6,11-dihydro-5H-dibenzo[b,e]azepine-6-carboxylic acid, C19H19NO3, (I), the molecules are linked into sheets by a combination of O-H...O and C-H...O hydrogen bonds; in the structure of the monomethyl analogue (6RS,11SR)-5-acetyl-11-ethyl-2-methyl-6,11-dihydro-5H-dibenzo[b,e]azepine-6-carboxylic acid, C20H21NO3, (II), the molecules are linked into simple C(7) chains by O-H...O hydrogen bonds; and in the structure of the dimethyl analogue (6RS,11SR)-5-acetyl-11-ethyl-1,3-dimethyl-6,11-dihydro-5H-dibenzo[b,e]azepine-6-carboxylic acid, C21H23NO3, (III), a combination of O-H...O, C-H...O and C-H...π(arene) hydrogen bonds links the molecules into a three-dimensional framework structure. None of these structures exhibits the R2(2)(8) dimer motif characteristic of simple carboxylic acids.
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