With no explanation, label each line with "O", "other-chemicalthing", "other-medical", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Doxepin
is
a
tertiary
amine
TCA
,
with
its
side
chain-demethylated
metabolite
nordoxepin
being
a
secondary
amine
.
Doxepin:other-medical
is:O
a:O
tertiary:O
amine:O
TCA:other-medical
,:O
with:O
its:O
side:O
chain-demethylated:O
metabolite:other-chemicalthing
nordoxepin:other-chemicalthing
being:O
a:O
secondary:O
amine:O
.:O