ritterazine A

(1″S,2S,2″R,3′S,3a′S,3a″S,4′S,4b″R,5′R,5″S,5‴S,6a′S,6a″R,9a″S,9b″S,12a″R,14a″S,17a″S,17b″S,19″R,19a″R,19b″S)-4′,5″,5‴,19″,19b″-Pentahydroxy-1″,3′,4′,5,5,5‴,9a″,17a″,19a″-no namethyl-3‴,3a′,3a″,4,4′,4‴,4b″,5,5″,5‴,6′,6″,6‴,6a′,6a″,7″,9″,9a″,9b″,10″,12a″,13″,14″,14a″,15″,17″,17a″,17b″,18″,19″,19a″,19b″-dotriacontahydro-3H,3′H-trispiro[furan-2, 2′-cyclopenta[b]furan-5′,12″-furo[3″,2″:3

(1″S,2S,2″R,3′S,3a′S,3a″S,4′S,4b″R,5′R,5″S,5‴S,6a′S,6a″R,9a″S,9b″S,12a″R,14a″S,17a″S,17b″S,19″R,19a″R,19b″S)-4′,5″,5‴,19″,19b″-Pentahydroxy-1″,3′,4′,5,5,5‴,9a″,17a″,19a″-no namethyl-3‴,3a′,3a″,4,4′,4‴,4b″,5,5″,5‴,6′,6″,6‴,6a′,6a″,7″,9″,9a″,9b″,10″,12a″,13″,14″,14a″,15″,17″,17a″,17b″,18″,19″,19a″,19b″-dotriacontahydro-3H,3′H-trispiro[furan-2, 2′-cyclopenta[b]furan-5′,12″-furo[3″,2″:3′,4′]cyclopenta[1′,2′:5,6]naphtho[1,2-b]indeno[4,5-i]phenazine-2″,2‴-pyran]-11″(1″H)-one

ritterazine A

Trispiro[furan-2(3H),2′-[2H]cyclopenta[b]furan-5′(3′H),12″(2″H)-furo[3″,2″:3′,4′]cyclopenta[1′,2′:5,6]naphth[1,2-b]indeno[4,5-i]phenazine-2″,2‴-[2H]pyran]-11″(1″H)-one, 3‴,3′a,3″a,4,4′,4″ ′,4″b,5,5″,5‴,6′,6″,6‴,6′a,6″a,7″,9″,9″a,9″b,10″,12″a,13″,14″,14″a,15″,17″,17″a,17″b,18″,19″,19″a,19″b-dotriacontahydro-4′,5″,5‴,19″,19″b-pentahydroxy-1″,3′,4′,5,5,5‴, 9″a,17″a,19″a-nonamethyl-, (1″S,2S,2″R,

ritterazine D