3'-Phosphoadenylyl sulfate + alpha-D-Glucosyl-1,6-alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,3-1-O-alkyl-2-O-acylglycerol <=> Adenosine 3',5'-bisphosphate + 6-Sulfo-alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,6-alpha-D-glucosyl-1,3-1-O-alkyl-2-O-acylglycerol