ChemDraw User's Manual - CambridgeSoft

Double bonds are bit encoded using a bitmask.The default value (0) indicates a normal (two solidlines) double bond, with the second line on the right(looking from the first atom to the second). Othervalues are as follows:valuebond type/position16 A double bond with one boldand one solid line.valuebond type/position32 A crossed bond.1 The second line is on the left(looking from the first atom tothe second).2 The two lines are centered.4 A double bond with onedashed and one solid line.8 A modifier to the previous twovalues, indicating that the userspecifically set the positioning.If this bit is not present,ChemDraw calculated thepositioning automatically.64 A double bond with twodashed lines.So, for example, a bitmask value of 13 (= 1 + 4 +8) means a double bond with one dashed and onesolid line (4), where the user specifically wants (8)the second line to be on the left (1).NOTE: This connection table format is obsolete, and isdocumented here for historical purposes only. This formatshould never be used for critical work where chemicalinformation is important.ChemDraw 9 Chemistry File Formats • 269Connection Table File Format