This suggests a base-catalyzed Michael addition of an OH− to the quinone ring (OH− can in principle substitute for any of the three hydrogens on the quinone ring; only one possibility is shown) (Scheme 2C).
Since T' must display ((x, a), y), there is only one possibility of grafting a in T b : a should be grafted on the edge (p x, x).
Since T must display (r, x, y), there is only one possibility of grafting x in T y z : x should be grafted on the parent of y.
Since T must display (r,(x, y)), there is only one possibility of grafting x in T y z : x should be grafted on the edge (p y, y).
Since T must display (r, y, z), there is only one possibility of grafting z in T x y : z should be grafted on the common parent of x and y.
Since T must display (r, y, z)), there is only one possibility of grafting z in T x y : z should be grafted on the edge (p y, y).
Inhibiting the growth of blood vessels is only one possibility.
But Rachel can allow for only one possibility.
Only one possibility worried me: that the U.S would impose a substantial oil import fee.
I could think of only one possibility for Eddie's words — Walt.
