4226
The synthesis of endo - adduct [ 4aS , 5S , 8R , 8aR , SS ] - 9d resulting from cycloaddition on the substituted C ( 2 ) - C ( 3 ) double bond was achieved in a chemo - and diastereoselective way from quinone 1d in the presence of ZnBr ( 2 ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None