secondary ammonium ion tamsulosin(1+) chebi_ontology C=1C=C(OCC[NH2+][C@@H](CC2=CC=C(C(=C2)S(N)(=O)=O)OC)C)C(=CC1)OCC C20H29N2O5S CHEBI:142544 InChI=1S/C20H28N2O5S/c1-4-26-17-7-5-6-8-18(17)27-12-11-22-15(2)13-16-9-10-19(25-3)20(14-16)28(21,23)24/h5-10,14-15,22H,4,11-13H2,1-3H3,(H2,21,23,24)/p+1/t15-/m1/s1 +1 (2R)-N-[2-(2-ethoxyphenoxy)ethyl]-1-(4-methoxy-3-sulfamoylphenyl)propan-2-aminium A secondary ammonium ion resulting from the protonation of the secondary amino group of tamsulosin. The major species at pH 7.3. 409.17917 DRHKJLXJIQTDTD-OAHLLOKOSA-O 409.522 ent-tamsulosin(1+) tamsulosin