CH3H3CCH3CH3H3CH3CCH3CH3CH3CH3CH3H3CCH3CH3CH3H3CH3CNH2NH2H2NNH2H2NH2NNHNHNHHNHNNNNHNHNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNOHOHOHHOHOHOOHOHOHHOHOHOHOHOOHOHOHHOOHHOOHOOHHOHOOHHOHOOHOHOHHOHOHOOHOHOHHOHOHOHOOHHOOHOHOHHOOHHOOHHOOHHOOHHOOHHOOOOSHSHHSSHSHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH