To obtain the subject new compound suitable for producing polymers satisfying the increasing demands of microelectronics.

An o-aminophenol carboxylic acid and an o-aminothiophenol carboxylic acid of formula I {A1-A7 are each H, CH3, OCH3, CH2CH3, OCH2CH3; T is O or S; (m) is 0 or 1; Z is a group of formula II [Q is C-A or N (A is H, F or the like)] or the like}. For example, a compound of formula III. The compound of formula I is obtained, for example, by allowing a nitro compound of formula IV (X is a halogen) and a nitro compound of formula V to react with an alkali metal hydroxide in a solvent at -10 to 80°C, and subsequently reducing the produced bis-o-nitro(thio)phenol into the bis-o-amino(thio)phenol.