PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
19708688-2	2009	The active oxidants in P450s have long been assumed to be iron(IV)-oxo porphyrin radical cations termed Compounds I, but P450 Compounds I have proven to be difficult to prepare.	ferryl iron	58-66	cytochrome P450 family 2 subfamily B member 6	Homo sapiens	23-27