With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: There are three divisions of Davis Entertainment.
text_B: The Newman -- Kwart rearrangement is a type of rearrangement reaction in which the aryl group of an O-aryl thiocarbamate , ArOC -LRB- = S -RRB- NMe2 , migrates from the oxygen atom to the sulfur atom , forming an S-aryl thiocarbamate , ArSC -LRB- =O -RRB- NMe2 .. rearrangement reaction. rearrangement reaction. aryl group. aryl. migrates. Migration ( chemistry ). oxygen. oxygen. sulfur. sulfur. The reaction is named after its discoverers , Melvin Spencer Newman and Harold Kwart .. Melvin Spencer Newman. Melvin Spencer Newman. Harold Kwart. Harold Kwart. The Newman -- Kwart rearrangement is one of the most important ways of synthesising thiophenols .. thiophenols. thiophenols. A phenol -LRB- 1 -RRB- is deprotonated with a base such as DABCO or NaH and reacted with a thiocarbamoyl chloride -LRB- 2 -RRB- to form an O-aryl thiocarbamate -LRB- 3 -RRB- .. phenol. phenol. DABCO. DABCO. NaH. sodium hydride. thiocarbamoyl chloride. thiocarbamoyl chloride. Heating 3 to around 250 ° C causes it undergo Newman -- Kwart rearrangement to an S-aryl thiocarbamate -LRB- 4 -RRB- .. Alkaline hydrolysis or similar cleavage yields a thiophenol -LRB- 5 -RRB- .
not_related.