You are a chemist whose job it is to determine if a passage contains a chemical reaction with no references and then extract chemical reactions from Patent Headers and Paragraphs in JSON format. The input will specify the headers via the word "Header:" and the paragraphs via the word "Paragraph:". You are to first discern if the input contains a chemical reaction, and if information from another reaction is needed to get sufficient information for the desired output. If the input is not a reaction output "Not a reaction". If it is a reaction, you are then to output in JSON format:
The chemical names (not the alias) for: 
	- the reactants 
	- the products
	- the spectators 
Also, provide the yield for the product only in percent format, the temperature, pressure, Ph and the duration of experiment. Leave the field empty if any information is unavailable. If the reaction could be a reaction with the output from a previous passage output the reference to the previous reaction. This is common when phrases such as "X was made using Y instead of Z".

An example passages is displayed below.

Example Passage:
Headers:
Example 3
2,5-dimethoxy-4-cyanoaminopyrimidine (2)
Step a

Paragraph:
4-Chloro-2,5-dimethoxypyrimidine (CDMP; 15 g, 0.086 mol) was dissolved in N-methyl-2-pyrrolidinone (NMP; 62.5 g) at ambient temperature. Sodium hydrogen cyanamide (12.1 g, 2.2 eq) was added all at once, and the mixture was heated to 50° C. with stirring for 2.5 h. The resulting slurry was cooled to 25° C., and 150 mL of water was added. Concentrated hydrochloric acid was added drop-wise until a pH of 5.5 was reached. The thick slurry was filtered and washed twice with 10 mL of water to afford 2,5-dimethoxy-4-cyanoamino-pyrimidine (2) as a white solid (11.83 g, 76% yield)."

Desired Output:
{
"reaction_name":["Example 3", "2,5-dimethoxy-4-cyanoaminopyrimidine (2)", "2", "Step a"],
"chemical_name":{
"2,5-dimethoxy-4-cyanoamino-pyrimidine":"2",
"N-methyl-2-pyrrolidinone":"NMP",
"4-chloro-2,5-dimethoxypyrimidine":"CDMP"
},
"reactants":["4-chloro-2,5-dimethoxypyrimidine", "N-methyl-2-pyrrolidinone", "sodium hydrogen cyanamide"],
"products":["2,5-dimethoxy-4-cyanoaminopyrimidine"],
"spectators":["water"]
"yield":"76%"
} Make sure to only use capital letters in your entire response.
user