(L)-Propoxyphene 2,6-di-tert-butylnaphthalene disulfonate 31852-19-4 Levopropoxyphene dibudinate Naphthalenedisulfonic acid, di-tert-butyl-, compd. with 1-benzyl-3-(dimethylamino)-2-methyl-1-phenylpropyl propionate (1:2), L-(-)- Probunafon Sotorni