etamiphylline etamiphylline etamiphylline or etamiphyllin (inn) is a xanthine intended for use as an anti-asthma agent. it has shown poor to absent effects in human clinical trials. etamiphylline names preferred iupac name 7--1,3-dimethyl-3,7-dihydro-1h-purine-2,6-dione identifiers cas number 314-35-2 y 3d model (jsmol) interactive image chemspider 26354 n echa infocard 100.005.678 kegg d07378 y pubchem cid 28329 unii 221a91bq2s y inchi inchi=1s/c13h21n5o2/c1-5-17(6-2)7-8-18-9-14-11-10(18)12(19)16(4)13(20)15(11)3/h9h,5-8h2,1-4h3 nkey: awklbioqciorsb-uhfffaoysa-n n smiles ccn(cc)ccn1cnc2c1c(=o)n(c(=o)n2c)c properties chemical formula c13h21n5o2 molar mass 279.33814 pharmacology atc code r03da06 (who) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references