preferred_name: beta-casomorphin-6 + L-isoleucine => beta-casomorphin-7 + H2O
preferred_name_lc: beta-casomorphin-6 + l-isoleucine => beta-casomorphin-7 + h2o
label: beta-casomorphin-6 + L-isoleucine => beta-casomorphin-7 + H2O
label_lc: beta-casomorphin-6 + l-isoleucine => beta-casomorphin-7 + h2o