PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 20441196-0 2010 First-principles lattice energy calculation of urea and hexamine crystals by a combination of periodic DFT and MP2 two-body interaction energy calculations. Methenamine 56-64 tryptase pseudogene 1 Homo sapiens 111-114