formaldehyde-[bis-(3,5-dichloro-2-hydroxy-benzyl)-acetal]

2-[[2-hydroxy-3-[(2-hydroxyphenyl)methyl]phenyl]methyl]-6-[(2-hydroxyphenyl)methyl]phenol

2,4-dichloro-6-[(5-chloro-2-hydroxyphenyl)methyl]phenol