The invention provides crystalline solid forms of -4–7-carbamoyl-1,1-diethyl-3-methoxy-1,2,3,4-tetrahydronaphthalen-2-ylamino)-2-cyclohexylmethyl-butyric acid. The present invention also relates to pharmaceutical compositions comprising the novel substituted oxindole derivatives of the formula I, and to their use for the treatment of vasopressin-related disorders. The upper arm portion can be pivotably connected to the lower arm portion and a pinch gear can adjust an angle between the upper arm portion and the lower arm portion.