The structure and absolute configuration of viridicatumtoxin: 2'S‐(2'α,7'aβ,11'aβ,12'β)‐7',7'a,8',11',11'a,12'‐hexahydro‐5',6',7'a,10',11'a,12'‐hexahydroxy‐3'‐methoxy‐2,6,6‐trimethyl‐7',8'‐dioxospiro[2‐cyclohexene‐1,2'(1'H)‐cyclopenta[de]naphthacene]‐9'‐carboxamide methanolate