| 4-(benzyloxycarbonyl)phenylboronic acid (contains varying amounts of anhydride) |
| 4-(benzyloxycarbonyl)benzeneboronic acid (contains varying amounts of anhydride) |
| 4-carbobenzoxyphenylboronic acid (contains varying amounts of anhydride) |
| 4-carbobenzoxybenzeneboronic acid (contains varying amounts of anhydride) |