kw.\*:("PENICILLINE(PHENYL) ESTER TRICHLORO-2,2,2ETHYLE,OXYDE-4\!ENT")
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SYNTHETIC STUDIES ON BETA -LACTAM ANTIBIOTICS. XIII: TRANSFORMATION OF 6-EPIPENICILLINS TO 2R-((1S,5S)-2-OXA-6-OXO-4,7-DIAZABICYCLO (3.2.0) HEPT-3-EN-7YL)-3-METHYLBUT-3-ENOATESHAMASHIMA Y; YAMAMOTO S; UYEO S et al.1979; TETRAHEDRON LETTERS; GBR; DA. 1979; NO 28; PP. 2595-2598; BIBL. 14 REF.Article