Showa Denko Kabushiki Kaisha

Other

Shosuke Okamoto

Yasuhiro Katsuura

Taketoshi Naito

Yoshio Kimura

Yoshio Okada

Morihiko Yamada

Norio Ohno

Akiko Okunomiya

Hiroshi Nojima

Yumi Seki

Takashi Shishikura

A phenylalanine derivative having the formula (I): ##STR1## where R.sup.1 and R.sup.2 are independently hydrogen provided that both R.sup.1 and R.sup.2 are not hydrogen at the same time;

Phenylalanine derivative and proteinase inhibitor

A phenylalanine derivative having the formula (I): ##STR1## wherein A represents ##STR2## B represents ##STR3## wherein m is 0, 1, or 2 and n is 3, 4, or 5; X represents (a) hydroxy, (b) nitro, (c) amino, (d) phenoxy which may be substituted with (i) halogen or (ii) nitro, (e) c.sub.1 -C.sub.4 alkyloxy which may be substituted wit (i) phenyl or (ii) benzoyl, (f) benzoyl, (g) pyridyloxy which may be substituted with (i) halogen or (ii) nitro, or (h) c.sub.1 -C.sub.4 alkyl which may by substituted with halogen;

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Tokyo, Japan

Yasuhiro Katsuura