lactam antibiotics from a Nocardia species - ACS Publications

Jan 16, 1976 - Antibiotics from a Nocardia Species. Sir: In view of their outstanding antimicrobial activity, the 0- lactam antibiotics have attracted...
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3023 "+COR2 COZEt I l l R=H, X=-O(CH212@-, Y=H2

I51 R1=

Hxz2,

R2=OH

I 2 1 R=Et, X=-@ICH 2 1 20-,Y=H2

(6) R1=

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RZ=2-~-indolyletiiyl~m~"~

1 3 ) R=Et. X=O, Y = H 2

1 7 1 R1=-CX@, R 2 --2-j-,,dolylethylamina

,

141 R=Et, X = @ , Y=-SICH213S-

9 R