X-Ray Study of 7a-(2-Chlorophenyl)-7a,8a,9,10,11,12ahexadronaptho[ 1',2':4,5]furo[3,2-d]pyrrolo[2,1-b]oxazole and 2-(4-fluorophenyl)-2-hydroxynaptho[2,1-b]furan-1(2H)-one