ethyl 3-(2',3',4,4'-tetramethoxy-1,1'-biphenyl-2-yl)prop-2-enoate

ethyl 2',3',4,4'-tetramethoxy-1,1'-biphenyl-2-propionate

6,7-dihydro-3,9,10,11-tetramethoxy-5H-dibenzo[a,c]cyclohepten-5-one

1,2,3,9-tetramethoxy-5-oxo-6,7-dihydro-5H-dibenzo[a,c]cycloheptene-6-carboxylic acid methyl ester

(2,3,4,7-Tetramethoxy-9,10-dihydro-[9]phenanthryl)-methanol