Hepatic metabolism of synthetic biliverdins -ethyl-1,19,21,24-tetrahyd
ro-2,8,13,17-tetramethyl - 1,19-dioxobilin-3,7,12-tripropionic acid (6
) and coprobiliverdin II beta (7) - substrates in vitro of biliverdin
reductase - showed that increasing hydrophilicity of bilirubins leads
to their biliary excretion without conjugation. (C) 1997 Elsevier Scie
nce Ltd.