With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
total
synthesis
of
Taxol
is
considered
a
hallmark
in
organic
synthesis
.
The:O
total:O
synthesis:O
of:O
Taxol:other-chemicalthing
is:O
considered:O
a:O
hallmark:O
in:O
organic:O
synthesis:O
.:O