With no explanation, label each line with "O", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Macrolides
belong
to
the
polyketide
class
of
natural
products
.
Macrolides:other-biologything
belong:O
to:O
the:O
polyketide:O
class:O
of:O
natural:O
products:O
.:O