18586
The endohedrally Mn - doped Si cationic cluster has a D3h fullerene - like structure featuring a closed - shell singlet ground state with a singlet - triplet gap of ~ 1 eV .
 Chemical: Mn - doped Si; Chemical: fullerene -
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Mn - doped Si; Chemical: fullerene -