3 5 with 10 naoh and extracted with ethyl acetate ethyl acetate layer was concentrated the resulting product was purified by silica gel column chromatography in a usually way elution was effected with chloroform methanol 30 1 the object compound was obtained as a whim crystal 0 175 g mp u00b0 c 142 143 5 ms m e 398 m 178 bp ir cm 1 kbr 2920 1638 1479 1422 1392 753 h nmr cdcl 3 ppm u03b41 55 1 90 2 30 2 70 8h m cyclohepta ring 2 06 3h s ch 3 5 44 2h s ch 2 6 65 7 04 7 28 7 86 8h m aromatic compounds 16 25 as shown in table 4 were prepared in a similar manner as described in example 15 table 4______________________________________ str25 str26 compound r sub 1 r sub 2 r sub 3 mp u00b0 c ______________________________________16 a h c sub 2 h sub 5 str27 124 617 a h c sub 3 h sub 7 str28 134 618 a h c sub 4 h sub 9 str29 109 110 519 a h c sub 5 h sub 11 str30 103 10420 b h c sub 4 h sub 9 str31 118 12021 a 5 i pro c sub 4 h sub 9 str32 87 922 a 6 i pro c sub 4 h sub 9 str33 83.