장문호 고훈영 2024-01-21T23:01:53Z 2024-01-21T23:01:53Z 2022-01-10 1993-01 https://pubs.kist.re.kr/handle/201004/146310 Semiempirical molecular orbital calculations on the reactivity of 2-cephems and 3cephems. Article 3 Korean j. med. chem., v.v. 3, pp.102 - ? Korean j. med. chem. v. 3 102 ? semiempirical molecular orbital calculations cephems