Ajauuaurv,  i^Im'}  Digitalis  Glucosidcs  and  Allied  Drugs.  33 
C22  H30  Os  (Kiliani,  Berichte  der  deutschen  chemischen 
Gessellschaft,  Berlin  1898,  p.  2458.) 
Anhydrodigitic  acid,  C10  H14  Os,  occurs  in  two  isomeric  modifica- 
tions, a-acid  and  /3-acid.  The  a-acid  is  formed  from  digitic 
acid  by  the  action  of  dehydrating  agents.  It  loses  its  water 
of  crystallisation  at  1400  C.  and  melts  at  1700  C.  The  /?-acid 
melts  at  263 0  C.    (Kiliani,  Archiv  der  Pharmazie  1894,  p.  334.) 
Anhydrogitaligenin,  according  to  Kraft,  is  formed  during  the 
hydrolysis  of  anhydrogitalin,  together  with  digitoxose  and  a 
non-crystalline  sugar.  It  crystallises  from  alcohol,  melts  at 
1190  C,  and  gives  a  deep  violet  Coloration  with  Kiliani's 
reagent.  (Schweizer  Wochenschrift  fur  Chemie  und  Phar- 
mazie 191 1,  p.  I/3-) 
Anhydrogitalin  is  a  product  of  decomposition  of  gitalin  q.  v. 
Desoxydigitogenic  acid,  C28  H42  09,  is  obtained  by  the  reduction 
of  digitogenic  acid  by  means  of  sodium  amalgam.  (Kiliani, 
Archiv  der  Pharmazie  1893,  p.  448.  Berichte  der  deutschen 
chemischen  Gesellschaft  Berlin  1899,  P-  2201-) 
Digalen,  see  digitoxin  solubile  Cloetta.  • 
Digitalacrin  (a-  and  /?-)  "  are  components  of  raw  digitalin  Walz 
(cf.  page  29). 
Digitalein  Xativelle  was  described  by  Nativelle  as  a  physiologically 
active  glucoside,  soluble  in  water  and  obtained  from  digitalis 
leaves.  (Moniteur  scientifique  1874,  p.  822.  Houdas, 
Comptes  rendus  de  l'academie  des  sciences,  Vol.  113,  p.  648.) 
Digitalein  Schmiedeberg  is  a  glucoside  soluble  in  water.  For  de- 
tails see  page  31.  (Archiv  fur  experimentelle  Pathologie  1875, 
Vol.  3.  p.  33.  —  Houdas,  Comptes  rendus  de  l'academie  des 
sciences.  Vol.  113,  p.  648.  —  Kiliani,  Berichte  der  deutschen 
chemischen  Gesellschaft  Berlin  1891.  p.  3950,  and  Archiv 
der  Pharmazie  1899,  p.  458.  Keller,  Berichte  der  deutschen 
pharmazeutischen  Gesellschaft  1897,  p.  125.) 
Digitaleine  Buignet  represented  the  glucosides  of  digitalis  leaves 
which  were  soluble  in  water.  (  Journal  de  pharmacie  et  de 
chimie  1872,  I,  p.  191.) 
Digitalen  is  a  special  preparation  for  therapeutic  use,  viz..  a  solu- 
tion of  digitalis  glucosides  containing  glycerin.  (Liiders, 
Chemische  Industrie  1905,  p.  261.) 
Digitaletin  is  a  product  of  decomposition  of  digitalin  Walz  and 
is  formed  from  the  latter  together  with  sugar  by  the  action 
