1-Octadecyl-3,3-dimethyl-6'-nitrospiro(indoline-2,2'-2H-benzopyran);1',3'-Dihydro-3',3'-dimethyl-6-nitro-1'-octadecylspiro[2H-1-benzopyran-2,2'-[2H]indole];1'-Octadecyl-3',3'-dimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-indoline]; SP 18;SP 18 (optical quencher)
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