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 ":".
Sulfuric
acid-catalyzed
ring
formation
gives
nomifensine
.
Sulfuric:other-chemicalthing
acid-catalyzed:O
ring:O
formation:O
gives:O
nomifensine:other-chemicalthing
.:O