With no explanation, label each line with "O", "other-biologything", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Cyclophosphamide
and
the
related
nitrogen
mustard–derived
alkylating
agent
ifosfamide
were
developed
by
Norbert
Brock
and
ASTA
(
now
Baxter
Oncology
)
.
Cyclophosphamide:other-biologything
and:O
the:O
related:O
nitrogen:O
mustard–derived:O
alkylating:O
agent:O
ifosfamide:O
were:O
developed:O
by:O
Norbert:organization-company
Brock:organization-company
and:O
ASTA:organization-company
(:O
now:O
Baxter:organization-company
Oncology:organization-company
):O
.:O