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 ":".
From
propionic
acid
and
thionyl
chloride
can
be
obtained
propanoyl
chloride
,
which
reacts
with
ethanolamine
in
the
presence
of
an
acid
scavenger
(
for
example
pyridine
)
to
N-propionyl-2-aminoethanol
.
From:O
propionic:other-chemicalthing
acid:other-chemicalthing
and:O
thionyl:other-chemicalthing
chloride:O
can:O
be:O
obtained:O
propanoyl:other-chemicalthing
chloride:O
,:O
which:O
reacts:O
with:O
ethanolamine:other-chemicalthing
in:O
the:O
presence:O
of:O
an:O
acid:O
scavenger:O
(:O
for:O
example:O
pyridine:other-chemicalthing
):O
to:O
N-propionyl-2-aminoethanol:other-chemicalthing
.:O