Tanabe Seiyaku Company, Limited

Hitoshi Kubota

Hiroshi Ohmizu

Kimiaki Hayashi

Toshikazu Suzuki

Keiko Tanaka

Yoshimasa Hashimura

Disclosed are a phenol compound represented by the formula (1): ##STR1## wherein R.sup.0 represents H, alkyl or alkyloxy; R.sup.1 represents alkyl; R.sup.2 represents alkyl or alkyloxy; OR.sup.3 represents OH; R.sup.4 represents H, lower alkyl or acyl, each of the above substituents may be substituted; W represents O, S or NR.sup.7 ; where R.sup.7 represents H, alkyl, aryl, OH or alkyloxy, a group of the formula (2): ##STR2## represents an amino which may be mono- or di-substituted or heterocyclic group containing N atom, or a pharmaceutically acceptable salt thereof, and a process for preparing the same.

Phenol compound having antioxidative activity and the process for

Disclosed are a process for preparing an optically active 2-oxoimidazolidine derivative of the formula: ##STR1## wherein R.sup.1 represents hydrogen atom or a lower alkyl group, according to the process described in the specification; and a 3-acyl-2-oxoimidazolidine-4-carboxylin acid ester derivative having (S, R) configuration of the formula: ##STR2## wherein R.sup.2 represents a tert-butyl group or a benzyl group, and R.sup.3 represents a lower alkyl group or an aryl group.

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Ashiya, Japan

Hitoshi Kubota