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 ":".
This
paper
reports
a
10
step
synthesis
of
4-HO-5-MeO-DMT
from
ortho-vanillin
.
This:O
paper:O
reports:O
a:O
10:O
step:O
synthesis:O
of:O
4-HO-5-MeO-DMT:other-chemicalthing
from:O
ortho-vanillin:O
.:O