label: methyl 2-[(3S)-9,10-dihydroxy-7-methoxy-1-oxo-1H,3H,4H-naphtho[2,3-c]pyran-3-yl]acetate + AH2 <=> semiviriditoxin + A
label_lc: methyl 2-[(3s)-9,10-dihydroxy-7-methoxy-1-oxo-1h,3h,4h-naphtho[2,3-c]pyran-3-yl]acetate + ah2 <=> semiviriditoxin + a