label: N(alpha)--fluorenylmethyloxycarbonylamino-4N-(1-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl)butyric acid
label_lc: n(alpha)--fluorenylmethyloxycarbonylamino-4n-(1-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl)butyric acid