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
variety
of
azidocoumarin
compounds
have
been
evaluated
.
A:O
variety:O
of:O
azidocoumarin:other-chemicalthing
compounds:O
have:O
been:O
evaluated:O
.:O