{"gt_parse": {"text_sequence": "h cases of serotonin syndrome suggesting s ome interaction with serot onergic neurons bu t the relationship has not been definitive ly de mo nst rat ed.It is more lipid-soluble th an morphine , resulting in a fa ster onset of ac tion. Its dur ation of clinical effec t is 120–150 minutes, altho ugh it is t ypically admi nistered at 4 – to 6-h our inter vals. Pethidin e has bee n shown to be less effect ive than morp hine, diamorp hine, or hy dromorpho"}}