With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
It
was
investigated
as
a
bronchodilator
but
was
never
marketed
.
It:O
was:O
investigated:O
as:O
a:O
bronchodilator:O
but:O
was:O
never:O
marketed:O
.:O