1233
The current - voltage curves and the rectification ratios ( RR ) for two different molecular rectifiers were obtained using a direct ab initio method at M06 / LACVP ( d ) level of theory in the range from - 2 to + 2 V .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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