has role has role has functional parent has functional parent tertiary alcohol carboxylic ester organic heterooctacyclic compound K-252a indolocarbazole semisynthetic derivative hemiaminal gamma-lactam KT 5720 antibiotic KT 5720 (9R,10S,12S)-2,3,9,10,11,12-hexahydro-10-hydroxy-9-methyl-1-oxo-9,12-epoxy-1H-diindolo[1,2,3-fg:3',2',1'-kl]pyrrolo[3,4-i][1,6]benzodiazocine-10-carboxylic acid hexyl ester chebi_ontology KT5720 KT-5720 CHEBI:85085 An organic heterooctacyclic compound that is 1<em>H</em>,1'<em>H</em>-2,2'-biindole in which the nitrogens have undergone formal oxidative coupling to positions 2 and 5 of hexyl (3<i>S</i>)-3-hydroxy-2-methyltetrahydrofuran-3-carboxylate (the 2<i>R</i>,3<i>S</i>,5<i>S</i> product), and in which the 3 and 3' positions of the biindole moiety have also undergone formal oxidative coupling to positions 3 and 4 of 1,5-dihydro-2<em>H</em>-pyrrol-2-one. EC 2.7.11.11 (cAMP-dependent protein kinase) inhibitor