1. cm ?1 ; HRESIMS m/z 551.2088 [M -H] -(calcd for C 34 H 31 O 7 , 551.2075); 1 H and 13 C NMR data see Table 1;Dracoropin A (1): White powder; UV ?MeOH max(log ?): 304 (0.27),1008
2. UV ?MeOH max(log ?): 270 (2.40), 220 (2.62) nm; IR (KBr) ? max : 3340;C Dracoropin;cm ?1 ; HRESIMS m/z 315.1213 [M + H] + (calcd for C 18 H 19 O 5 , 315.1227); 1 H and 13 C NMR data see Table 1. R-(+)-3,0981
3. ECD (MeOH) ? max (??);MeOH)
4. MeOH); ECD (MeOH) ? max (??) 235 (+ 22.31);1116 cm ?1 ; HRESIMS m/z 367.1134 [M + Na] + (calcd for C 19 H 20 O 6 Na, 367.1152); 1 H and 13 C NMR data see Table 2. (2S,3S)-(+)-4 (4a): [?]23 D + 66,1046