\chemfig{
                \mcfatomno{1}% 1
        -[:90,2]\mcfatomno{2}% 2
           -[,2]\mcfatomno{5}% 5
       -[:270,2]\mcfatomno{3}% 3
                   (
           -[:180,2]\phantom{1}% -> 1
                   )
    -[:45,1.131]\mcfatomno{7}% 7
       -[:180,2]\mcfatomno{4}% 4
                   (
       -[:225,1.131]\phantom{1}% -> 1
                   )
        -[:90,2]\mcfatomno{6}% 6
                   (
       -[:225,1.131]\phantom{2}% -> 2
                   )
           -[,2]\mcfatomno{8}% 8
                   (
       -[:225,1.131]\phantom{5}% -> 5
                   )
                   (
           -[:270,2]\phantom{7}% -> 7
                   )
}