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 ":".
A
salen
cobalt
catalyst
was
reported
in
2005
to
provide
isotactic
polymerization
of
the
prochiral
propylene
oxide
A:O
salen:O
cobalt:other-chemicalthing
catalyst:O
was:O
reported:O
in:O
2005:O
to:O
provide:O
isotactic:O
polymerization:O
of:O
the:O
prochiral:O
propylene:O
oxide:O