New quinone compounds of the formula:
wherein R1 is methyl or methoxy, or two of R1 jointly represent -CH=CH-CH=CH-; X is -CH=CH- or -C=C-; Y1 is hydrogen, hydroxyl, carboxyl, cyano, acyloxy or -COZ in which Z is amino which may be substituted; m is an integer of 0 to 3; n is an integer of 0 to 10; n' is an integer of 1 to 5; k is an integer of 1 to 3; and when k is 2 or 3, n' is optionally variable within the range of 1 to 5 in its two or three times appearances; and their hydroquinone forms and salts, have useful physiological activities such as antiasthmatic, antiallergic and bloodpressure decreasing activities.