has role has parent hydride intercalator phenanthridine ethidium +1 3,8-diamino-5-ethyl-6-phenylphenanthridinium 314.166 314.40372 Beilstein:3627183 C21H20N3 CAS:3546-21-2 CC[n+]1c(-c2ccccc2)c2cc(N)ccc2c2ccc(N)cc12 CHEBI:42478 ETHIDIUM Gmelin:981639 InChI=1S/C21H19N3/c1-2-24-20-13-16(23)9-11-18(20)17-10-8-15(22)12-19(17)21(24)14-6-4-3-5-7-14/h3-13,23H,2,22H2,1H3/p+1 PDBeChem:ET QTANTQQOYSUMLC-UHFFFAOYSA-O The fluorescent compound widely used in experimental cell biology and biochemistry to reveal double-stranded DNA and RNA. chebi_ontology ethidium cation homidium fluorochrome phenanthridines