Chugai Seiyaku Kabushiki Kaisha

Hisao Endo

Yusuke Harada

Isao Matsunaga

Minoru Shindo

Nobuhiro Oi

Haruki Ogawa

Hiroshi Okazaki

Takao Noto

Teizo Shinozaki

Bunya Aoki

Takao Kimura

Kanji Moro

Toshiyuki Nebashi

Toshio Kuroki

Masahiko Matsumoto

Kana Kojima

.alpha.-Substituted ureido-benzylpenicillanic acids of the formula ##STR1## (wherein R.sup.1, X and Y are as defined in the description) and pharmaceutically acceptable salts thereof, and a bactericidal composition comprising the above penicillanic acid or the salt and a pharmaceutically acceptable carrier are disclosed. The acids and salts thereof have high antibacterial activities against Gram-positive and Gram-negative bacteria, particularly those of the genus Pseudomonas.

.alpha.-Substituted ureido-benzylpenicillanic acids

Cephalosporin derivatives which have an excellent antibacterial action particularly against bacteria belonging to genus Pseudomonas or Serratia and are represented by the formula: ##STR1## wherein R.sub.1 R.sub.2, R.sub.3, R.sub.4, R.sub.5 and n are as defined in the specification, and salts thereof; a process for preparing the same; and an antibacterial preparation containing the same as an active ingredient are disclosed.

Cephalosporin derivatives

Cephalosporin derivatives which have an excellent antibacterial action particularly against bacteria belonging to genus Pseudomonas or Serratia and are represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and n are as defined in the specification, and salts thereof; a process for preparing the same; and an antibacterial preparation containing the same as an active ingredient are disclosed.

Penicillanic acid derivatives which have an excellent antibacterial action particularly against bacteria belonging to family Pseudomonas aeruginosa and are represented by the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 and n are as defined above, and salts thereof; and a process for preparing the same are disclosed.

Penicillanic acid derivatives

Growing community of inventors

Yokohama, Japan

Hisao Endo