Words to Describe biphenyls

How biphenyls often is described ("________ biphenyls")

• degraded
• substituted
• toxic
• isomeric
• halogenated
• bridged
• perinatal
• polycyclic
• chlorinated
• hydroxylated
• introduction
• active
• commercial
• ortho
• atmospheric
• monochlorinated
• brominated
• cyano
• optically
• coplanar
• disubstituted
• chiral
• dietary
• technical