(2S,3R,3aS,6S,6a′S,6b′S,7aR,12a′S,12b′R)-3,6,11′,12b′-Tetramethyl-1′,2′,3a,4,5,5′,6,6′,6a′,6b′,7,7′,7a,8′,10′,12′,12a′,12b′-octadecahydro-3H,3′H-spiro[furo[3,2-b]pyridine-2,9′-naphtho[2,1-a]azulen]-3′ -one

(2S,3R,3aS,6S,6a′S,6b′S,7aR,12a′S,12b′R)-3,6,11′,12b′-Tetramethyl-1′,2′,3a,4,5,5′,6,6′,6a′,6b′,7,7′,7a,8′,10′,12′,12a′,12b′-octadecahydro-3H,3′H-spiro[furo[3,2-b]pyridine-2,9′-naphtho[2,1-a]azulen]-3′ -one

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Spiro[furo[3,2-b]pyridine-2(3H),9′(3′H)-naphth[2,1-a]azulen]-3′-one, 1′,2′,3a,4,5,5′,6,6′,6′a,6′b,7,7′,7a,8′,10′,12′,12′a,12′b-octadecahydro-3,6,11′,12′b-tetramethyl-, (2S,3R,3aS,6S,6a′S,6b′S,7aR,12a′ S,12b′R)-

(1′S,2S,2′R,3R,3aS,6S,7aR,10′S,11′S)-2′,3,6,16′-tetramethyl-3a,4,5,6,7,7a-hexahydro-3H-spiro[furo[3,2-b]pyridine-2,14′-tetracyclo[8.8.0.02,7.011,17]octadecane]-6′,16′-dien-5′-one

(2S,3R,3aS,6S,6a′S,6b′S,7aR,12a′S,12b′R)-3,6,11′,12b′-tetramethyl-1′,2′,3a,4,5,5′,6,6′,6a′,6b′,7,7′,7a,8′,10′,12′,12a′,12b′-octadecahydro-3H,3′H-spiro[furo[3,2-b]pyridine-2,9′-naphtho[2,1-a]azulen]-3′-one

(2S,3R,3aS,6S,6a′S,6b′S,7aR,12a′S,12b′R,Z)-3,6,11′,12b′-tetramethyl-3a,4,5,5′,6,6′,6a′,6b′,7,7a,7′,8′,10′,12′,12a′,12b′-hexadecahydro-1′H,3H-spiro[furo[3,2-b]pyridine-2,9′-naphtho[2,1-a]azulen]-3′(2′H)-one

spiro[furo[3,2-b]pyridine-2(3H),9′(3′H)-naphth[2,1-a]azulen]-3′-one, 1′,2′,3a,4,5,5′,6,6′,6′a,6′b,7,7′,7a,8′,10′,12′,12′a,12′b-octadecahydro-3,6,11′,12′b-tetramethyl-, (2S,3R,3aS,6S,6a′S,6b′S,7aR,12a′S,12b′R)-