| abstract |
A hydroquinone derivative useful as an intraocular pressure lowering, anti-hypertensive and radical scavenging agent represented by the following formula n n n wherein B 1 and B 2 in formula (I) are the same or different and at any position on the benzene ring (when W is nitrogen, however, at any other position on the benzene ring) and each denotes a substituent selected from the group consisting of hydrogen, halogen, hydroxyl, lower alkoxyl and carboxyl, and the substituent CH 3 is at position 2 or 3, and W are the same or different and each denotes a nitrogen or carbon atom. R 1 , R 2 , R 3 and R 4 in formula (II) are the same or different and each denotes a substituent selected from the group consisting of hydrogen, lower alkyl and lower alkoxyl, and B 1 and B 2 are as hereinbefore defined, or a pharmacologically acceptable salt thereof. |