2092-49-1 3,3'-Biphenyldicarboxaldehyde, 6,6'-dihydroxy-5,5'-dimethoxy- 5,5'-Bivanillin Dehydrodivanillin NSC16723 [1,1'-Biphenyl]-3,3'-dicarboxaldehyde, 6,6'-dihydroxy-5,5'-dimethoxy-