melarsomine melarsomine melarsomine (melaminylthioarsenate) is an arsenic-based anthelmintic. in the u.s., it is marketed under the trade names immiticide (merial) and diroban (zoetis), and is approved by the fda's center for veterinary medicine for the treatment of adult heartworm (dirofilaria immitis) infection in dogs. it is not approved for treatment in cats, or dogs in late-stage infection. melarsomineclinical datatrade namesimmiticide, dirobanahfs/drugs.cominternational drug namesatc codenoneidentifiers iupac name bis(2-aminoethyl) arsonodithioite cas number128470-15-5pubchem cid65962chemspider59365unii374gj0s41akeggd08168 ycomptox dashboard (epa)dtxsid40155907 chemical and physical dataformulac13h21asn8s2molar mass428.41 g·mol−13d model (jsmol)interactive image smiles c1=cc(=cc=c1nc2=nc(=nc(=n2)n)n)(sccn)sccn inchi inchi=1s/c13h21asn8s2/c15-5-7-23-14(24-8-6-16)9-1-3-10(4-2-9)19-13-21-11(17)20-12(18)22-13/h1-4h,5-8,15-16h2,(h5,17,18,19,20,21,22)key:mgeolzfmlhycfz-uhfffaoysa-n (verify)