\documentclass[10pt,landscape]{article}

\usepackage{chemfig}

\setdoublesep{0.091 cm}             % Bond Spacing
\setatomsep{14.4 pt}                % Bond length
\setcrambond{2 pt}{1 pt}{2.5 pt}    % {Bold width}{1pt}{Hash spacing}
\setbondoffset{1.6 pt}              % Margin Width
\setbondstyle{line width=0.6 pt}    % Line width 

\renewcommand*\printatom[1]{\normalsize \ensuremath{\mathsf{#1}}} 
\renewcommand{\familydefault}{\sfdefault}

\begin{document}
\hspace{-1.5in}
\schemestart
% ALBENDAZOLE @c1
\chemname{
    \chemfig{
    -[:30] -[:-30] -[:30]S -[:-30] 
    *6( =  %bottom
        - 
        = *5(-N
             = ( -\chembelow{N}{H} -[:60]( =[:120]O ) -O -[:60] )
             -\chemabove{N}{H}  
             -
             -
             )
        - %top
        =
        -
        )
    }
}{albendazole}
\arrow(.mid east--.mid west){<->[FMO][]}[30,2] % alb -> + alb sulfoxide
\setlewis{}{}{magenta}
%ALBENDAZOLE SULFOXIDE (+)
\chemname{
    \chemfig{
    -[:30] -[:-30] -[:30]S ( <[:120,1.25,,,,magenta]\color{magenta}{O} ) ( <:[:50,1.25,,,,magenta]\color{white}{\Lewis{1:,.}} ) -[:-30] 
    *6( =  %bottom
        - 
        = *5(-N
             = ( -\chembelow{N}{H} -[:60]( =[:120]O ) -O -[:60] )
             -\chemabove{N}{H}  
             -
             -
             )
        - %top
        =
        -
        )
    }
}{R(+)-albendazole sulfoxide}
\arrow(@c1.mid east--.mid west){<->[][CYP]}[-30,2] % alb -> - alb sulfoxide
\arrow(@[email protected]){->[\sf{CYP}]}[30,2]
\setlewis{}{}{magenta}
%ALBENDAZOLE SULFOXIDE (-)
\chemname {
    \chemfig{
    -[:30] -[:-30] -[:30]S ( <[:120,1.25,,,,magenta]\color{white}{\Lewis{3:,.}} ) ( <:[:50,1.25,,,,magenta]\color{magenta}{O} ) -[:-30] 
    *6( =  %bottom
        - 
        = *5(-N
             = ( -\chembelow{N}{H} -[:60]( =[:120]O ) -O -[:60] )
             -\chemabove{N}{H}  
             -
             -
             )
        - %top
        =
        -
        )
    }
}{S(-)-albendazole sulfoxide}
\arrow(.east--.west){->[][CYP]}[30,2]
%ALBENDAZOLE SULFONE
\chemname {
    \chemfig{
    -[:30] -[:-30] -[:30]S ( =[:60,,,,,magenta]\color{magenta}{O} )( =[:120,,,,,magenta]\color{magenta}{O} ) -[:-30] 
    *6( =  %bottom
        - 
        = *5(-N
             = ( -\chembelow{N}{H} -[:60]( =[:120]O ) -O -[:60] )
             -\chemabove{N}{H}  
             -
             -
             )
        - %top
        =
        -
        )
    }
}{albendazole sulfone}
\schemestop
\end{document}