{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,14]],"date-time":"2026-06-14T09:45:20Z","timestamp":1781430320157,"version":"3.54.1"},"reference-count":0,"publisher":"National Academy of Sciences","issue":"5","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[1974,5]]},"abstract":"<jats:p>\n                    Chromic acid degradation of a\n                    <jats:italic>d<\/jats:italic>\n                    -urobilin, obtained after incubation of bilirubin in fecal bacterial cultures, gave methylvinylmaleimide and methylethylmaleimide. The\n                    <jats:italic>d<\/jats:italic>\n                    -urobilin, molecular weight 588, C\n                    <jats:sub>33<\/jats:sub>\n                    H\n                    <jats:sub>40<\/jats:sub>\n                    -N\n                    <jats:sub>4<\/jats:sub>\n                    O\n                    <jats:sub>6<\/jats:sub>\n                    , clearly showed the presence of both vinyl and ethyl resonances in the nuclear magnetic resonance spectrum. These results point unambiguously to a urobilin structure with one vinyl and one ethyl\n                    <jats:italic>beta<\/jats:italic>\n                    -substituent.\n                  <\/jats:p>","DOI":"10.1073\/pnas.71.5.1599","type":"journal-article","created":{"date-parts":[[2006,5,31]],"date-time":"2006-05-31T02:55:31Z","timestamp":1149044131000},"page":"1599-1601","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":8,"title":["On the Existence of a Mono-Vinyl\n                    <i>d<\/i>\n                    -Urobilin"],"prefix":"10.1073","volume":"71","author":[{"given":"M.","family":"Chedekel","sequence":"first","affiliation":[{"name":"Department of Chemistry, Iowa State University, Ames, Iowa 50010"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F. A.","family":"Bovey","sequence":"additional","affiliation":[{"name":"Bell Laboratories, Murray Hill, New Jersey 07974"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. I. R.","family":"Brewster","sequence":"additional","affiliation":[{"name":"Bell Laboratories, Murray Hill, New Jersey 07974"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z. J.","family":"Petryka","sequence":"additional","affiliation":[{"name":"University of Minnesota Medical Research Unit, Northwestern Hospital, Minneapolis, Minn. 55407"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Weimer","sequence":"additional","affiliation":[{"name":"University of Minnesota Medical Research Unit, Northwestern Hospital, Minneapolis, Minn. 55407"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. J.","family":"Watson","sequence":"additional","affiliation":[{"name":"University of Minnesota Medical Research Unit, Northwestern Hospital, Minneapolis, Minn. 55407"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albert","family":"Moscowitz","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Minnesota, Minneapolis, Minn. 55455"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. A.","family":"Lightner","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Texas Tech University, Lubbock, Texas 79409"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[1974,5]]},"container-title":["Proceedings of the National Academy of Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pnas.org\/doi\/pdf\/10.1073\/pnas.71.5.1599","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,4,13]],"date-time":"2022-04-13T10:25:38Z","timestamp":1649845538000},"score":1,"resource":{"primary":{"URL":"https:\/\/pnas.org\/doi\/full\/10.1073\/pnas.71.5.1599"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1974,5]]},"references-count":0,"journal-issue":{"issue":"5","published-print":{"date-parts":[[1974,5]]}},"alternative-id":["10.1073\/pnas.71.5.1599"],"URL":"https:\/\/doi.org\/10.1073\/pnas.71.5.1599","relation":{},"ISSN":["0027-8424","1091-6490"],"issn-type":[{"value":"0027-8424","type":"print"},{"value":"1091-6490","type":"electronic"}],"subject":[],"published":{"date-parts":[[1974,5]]},"assertion":[{"value":"1974-05-01","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}